Patent Publication Number: US-2023151755-A1

Title: Decomposition chamber

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATION 
     This application claims the benefit of U.S. Provisional Application No. 62/942,470, filed Dec. 2, 2019, the entire disclosure of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present application relates generally to decomposition chambers for an exhaust gas aftertreatment system of an internal combustion engine. 
     BACKGROUND 
     For internal combustion engines, such as diesel engines, nitrogen oxide (NO x ) compounds may be emitted in exhaust. It may be desirable to reduce NO x  emissions to comply with environmental regulations, for example. To reduce NO x  emissions, a reductant may be dosed into the exhaust by a dosing system and within an aftertreatment system. The reductant facilitates conversion of a portion of the exhaust into non-NO x  emissions, such as nitrogen (N 2 ), carbon dioxide (CO 2 ), and water (H 2 O), thereby reducing NO x  emissions. 
     The exhaust and reductant react within a component of the aftertreatment system. This component is typically configured to attain a specific conversion of the exhaust into non-NO x  emissions. However, this configuration typically decreases performance and efficiency of the aftertreatment system. For example, this configuration may cause an increase in back pressure on an internal combustion engine which can cause decreased efficiency of the internal combustion engine. 
     SUMMARY 
     In one embodiment, a decomposition chamber for an exhaust gas aftertreatment system includes an inlet tube, a selective catalytic reduction (SCR) catalyst member, a mixing collector wall, a distribution cap, and a dividing tube. The inlet tube is configured to receive exhaust gas. The mixing collector wall includes a mixing assembly flow aperture. The distribution cap is coupled to the inlet tube and configured to receive the exhaust gas from the inlet tube. The dividing tube is coupled to the mixing collector wall. The dividing tube separates the distribution cap from the mixing assembly flow aperture. The dividing tube includes a first dividing tube inlet aperture that is configured to receive the exhaust gas from the distribution cap. The dividing tube outlet aperture is configured to provide the exhaust gas to the mixing assembly flow aperture. 
     In another embodiment, a decomposition chamber for an exhaust gas aftertreatment system includes a selective catalytic reduction (SCR) catalyst member, a distribution cap, a mixing collector wall, and a dividing tube assembly. The distribution cap is configured to receive exhaust gas. The mixing collector wall includes a mixing assembly flow aperture. The dividing tube assembly extends between a first portion of the mixing collector wall and a second portion of the mixing collector wall. The dividing tube assembly includes an inlet dividing tube and an outlet dividing tube. The inlet dividing tube has an inlet dividing tube inlet aperture that is configured to receive the exhaust gas from the distribution cap. The outlet dividing tube is configured to receive the exhaust gas from the inlet dividing tube. The outlet dividing tube has an outlet dividing tube outlet aperture that is configured to provide the exhaust gas to the mixing assembly flow aperture. 
     In yet another embodiment, a decomposition chamber for an exhaust gas aftertreatment system includes a selective catalytic reduction (SCR) catalyst member, a distribution cap, a mixing collector wall, a mixing assembly wall, an outer housing wall, and a dividing tube. The SCR catalyst member is configured to receive exhaust gas. The mixing collector wall includes a mixing assembly flow aperture. The mixing assembly wall is coupled to the mixing collector wall. The outer housing wall is coupled to the mixing assembly wall. The dividing tube is coupled to the mixing collector wall around the mixing assembly flow aperture. The dividing tube separating the distribution cap from the mixing assembly flow aperture. The dividing tube includes a dividing tube body, a dividing tube inlet aperture, a dividing tube body bypass opening, and a dividing tube outlet aperture. The dividing tube body is separated from the outer housing wall. The dividing tube inlet aperture extends through the dividing tube body and is configured to receive the exhaust gas from the distribution cap. The dividing tube body bypass opening extends through the dividing tube body. The dividing tube body bypass opening is aligned with the dividing tube inlet aperture, in confronting relation with the mixing assembly wall. The dividing tube body bypass opening is configured to receive the exhaust gas from between the dividing tube body and the mixing collector wall. The dividing tube outlet aperture is configured to provide the exhaust gas to the mixing assembly flow aperture. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages of the disclosure will become apparent from the description, the drawings, and the claims, in which: 
         FIG.  1    is a block schematic diagram of an example exhaust gas aftertreatment system; 
         FIG.  2    is an exploded view of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  3    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  4    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  5    is a cross-sectional view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  6    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  7 A  is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  7 B  is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  7 A , taken along plane A-A; 
         FIG.  8    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  9 A  is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  8   , taken along plane B-B; 
         FIG.  9 B  is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  8   , taken along plane C-C; 
         FIG.  10    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  9 A , taken along plane D-D; 
         FIG.  11    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  12    is a cross-sectional view of a portion of the dividing tube shown in  FIG.  11   , taken along plane E-E; 
         FIG.  13    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  14    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  13   , taken along plane F-F; 
         FIG.  15    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  14   , taken along plane G-G; 
         FIG.  16    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  17    is a cross-sectional view of a portion of the dividing tube shown in  FIG.  16   , taken along plane H-H; 
         FIG.  18    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  19    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  18   , taken along plane J-J; 
         FIG.  20    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  21    is a top perspective view of an example transfer tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  22    is a bottom perspective view of the transfer tube shown in  FIG.  21   ; 
         FIG.  23    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  24    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  25    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  26    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  27    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  28    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  29    is an exploded view of a dividing tube for the decomposition chamber shown in  FIG.  28   ; 
         FIG.  30    is a rear exploded view of a portion of the decomposition chamber shown in  FIG.  28   ; 
         FIG.  31 A  is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  28   , taken along plane K-K; 
         FIG.  31 B  is another cross-sectional view of a portion of the decomposition chamber shown in  FIG.  28   , taken along plane K-K; 
         FIG.  32    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  28   , taken along plane L-L; 
         FIG.  33    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  28   , taken along plane M-M; 
         FIG.  34    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  35    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  34   , taken along plane N-N; 
         FIG.  36    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  34   , taken along plane P-P; 
         FIG.  37    is a perspective view of a portion of the example decomposition chamber shown in  FIG.  34   ; 
         FIG.  38    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  34   , taken along plane Q-Q. 
         FIG.  39    is a cross-sectional view of a portion of an example decomposition chamber; 
         FIG.  40    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  41    is another perspective view of the dividing tube shown in  FIG.  40   ; 
         FIG.  42    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  43    is another perspective view of the dividing tube shown in  FIG.  42   ; 
         FIG.  44    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  45    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  46    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  47    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  46   , taken along plane R-R; 
         FIG.  48    is a perspective view of a dividing tube for the decomposition chamber shown in  FIG.  46   ; 
         FIG.  49    is a front view of the dividing tube shown in  FIG.  48   ; 
         FIG.  50    is a perspective view of a dividing tube collector for the decomposition chamber shown in  FIG.  46   ; 
         FIG.  51    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  52    is another perspective view of the dividing tube shown in  FIG.  51   ; 
         FIG.  53    is a perspective view of a first dividing tube flange for the dividing tube shown in  FIG.  51   ; 
         FIG.  54    is a perspective view of another first dividing tube flange for the dividing tube shown in  FIG.  51   ; 
         FIG.  55    is a perspective view of another first dividing tube flange for the dividing tube shown in  FIG.  51   ; 
         FIG.  56    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  57    is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  56   , taken along plane S-S; 
         FIG.  58    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  59    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  60    is another perspective view of the dividing tube shown in  FIG.  59   ; 
         FIG.  61    is a perspective view of the dividing tube shown in  FIG.  59   ; 
         FIG.  62    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  63 A  is another perspective view of the decomposition chamber shown in  FIG.  62   ; 
         FIG.  63 B  is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  63 A , taken along plane T-T; 
         FIG.  63 C  is a cross-sectional view of a portion of the decomposition chamber shown in  FIG.  63 A , taken along plane U-U; 
         FIG.  64    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  65    is another perspective view of the dividing tube shown in  FIG.  64   ; 
         FIG.  66    is a cross-sectional view of the dividing tube shown in  FIG.  64   , taken along plane V-V; 
         FIG.  67    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  68    is another perspective view of the dividing tube shown in  FIG.  67   ; 
         FIG.  69    is a bottom view of the dividing tube shown in  FIG.  67   ; 
         FIG.  70    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  71    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  72    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  73    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  74    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  75    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  76    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  77    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  78 A  is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  78 B  is a cross-sectional view of the dividing tube shown in  FIG.  78 A , taken along plane X-X; 
         FIG.  78 C  is a cross-sectional view of the dividing tube shown in  FIG.  78 A , taken along plane W-W; 
         FIG.  78 D  is another perspective view of the dividing tube shown in  FIG.  78 A ; 
         FIG.  79    is a cross-sectional view of the dividing tube shown in  FIG.  78 D , taken along plane Y-Y; 
         FIG.  80    is a cross-sectional view of the dividing tube shown in  FIG.  78 D , taken along plane Z-Z; 
         FIG.  81    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  82    is another perspective view of the decomposition chamber shown in  FIG.  81   ; 
         FIG.  83    is another perspective view of the decomposition chamber shown in  FIG.  81   ; 
         FIG.  84    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  85    is another perspective view of the decomposition chamber shown in  FIG.  84   ; 
         FIG.  86    is a perspective cross-sectional view of the dividing tube shown in  FIG.  84   , taken along plane AA-AA; 
         FIG.  87    is a cross-sectional view of the dividing tube shown in  FIG.  84   , taken along plane BB-BB; 
         FIG.  88    is a cross-sectional view of the decomposition chamber shown in  FIG.  84   , taken along plane AA-AA; 
         FIG.  89    is another perspective cross-sectional view of the decomposition chamber shown in  FIG.  84   , taken along plane AA-AA; 
         FIG.  90    is another perspective cross-sectional view of the decomposition chamber shown in  FIG.  84   ; 
         FIG.  91    is another perspective cross-sectional view of the decomposition chamber shown in  FIG.  84   ; 
         FIG.  92    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  93    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  94    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  95    is a cross-sectional view of the dividing tube shown in  FIG.  94   , taken along plane CC-CC; 
         FIG.  96    is a perspective cross-sectional view of the dividing tube shown in  FIG.  94   , taken along plane CC-CC; 
         FIG.  97    is another perspective view of the dividing tube shown in  FIG.  94   ; 
         FIG.  98    is a perspective cross-sectional view of the dividing tube shown in  FIG.  94   , taken along plane DD-DD; 
         FIG.  99    is a perspective view of an example dividing tube for a decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  100    is a perspective cross-sectional view of the dividing tube shown in  FIG.  100   , taken along plane EE-EE; 
         FIG.  101    is a perspective cross-sectional view of the dividing tube shown in  FIG.  100   , taken along plane FF-FF; 
         FIG.  102    is a perspective cross-sectional view of the dividing tube shown in  FIG.  100   , taken along plane FF-FF; 
         FIG.  103    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  104    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  105    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  106    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  107    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  108 A  is a side wireframe view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  108 B  is a cross-sectional view of the decomposition chamber shown in  FIG.  108 A ; 
         FIG.  109    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  110    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  111    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  112    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  113    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  114    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  115    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  116    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  117    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  118    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  119    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  120    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  121    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  122    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  123    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  124    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  125    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  126    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  127    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  128    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  129    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  130    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  131    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  132    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  133    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  134    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  135    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  136    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  137    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  138    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  139    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; 
         FIG.  140    is a perspective view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system; and 
         FIG.  141    is a front view of a portion of an example decomposition chamber for an exhaust gas aftertreatment system. 
     
    
    
     It will be recognized that some or all of the Figures are schematic representations for purposes of illustration. The Figures are provided for the purpose of illustrating one or more implementations with the explicit understanding that they will not be used to limit the scope or the meaning of the claims. 
     DETAILED DESCRIPTION 
     Following below are more detailed descriptions of various concepts related to, and implementations of, methods, apparatuses, and for decomposing exhaust gas in an exhaust gas aftertreatment system of an internal combustion engine. The various concepts introduced above and discussed in greater detail below may be implemented in any of a number of ways, as the described concepts are not limited to any particular manner of implementation. Examples of specific implementations and applications are provided primarily for illustrative purposes. 
     I. Overview 
     Internal combustion engines (e.g., diesel internal combustion engines, etc.) produce exhaust gas that contains constituents, such as NO x , N 2 , CO 2 , and/or H 2 O. In some applications, an exhaust gas aftertreatment system is utilized to dose the exhaust gas with a reductant so as to reduce NO x  emissions in the exhaust gas. These exhaust gas aftertreatment systems may include a decomposition chamber within which the reductant is provided and mixed with the exhaust gas. 
     Enhancing mixing of the reductant and exhaust gas can increase desirability of an exhaust gas aftertreatment system. However, enhancing mixing of the reductant and exhaust gas can lead to increasing the backpressure of the decomposition chamber (e.g., on an internal combustion engine having the exhaust gas aftertreatment system, etc.), thereby decreasing desirability of the exhaust gas aftertreatment system (e.g., because performance of the internal combustion engine is negatively impacted by the increased backpressure, etc.). Additionally, the reductant may form deposits within the exhaust gas aftertreatment system, such as on internal surfaces of the decomposition chamber, which can decrease desirability of the decomposition chamber because the backpressure of the decomposition chamber is increased, and/or because NO x  emissions cannot be desirably reduced. 
     Implementations described herein are related to various decomposition chambers that mix reductant and exhaust gas in ways that do not increase backpressure and that mitigate formation of reductant deposits, thereby increasing the desirability of the decomposition chambers described herein compared to other decomposition chambers. 
     Some implementations described herein relate to a decomposition chamber with concentration walls that form a throat portion and swirl cavities. The exhaust gas is propelled by the concentration walls through the throat portion where velocity of the exhaust gas is increased and subsequently provided into the swirl cavities where the exhaust gas is swirled to increase mixing of the reductant and exhaust gas. 
     Some implementations described herein relate to a decomposition chamber with channel walls and flow guides that swirl the exhaust gas. The decomposition chamber also includes baffles to shield a distribution cap from impingement of reductant. 
     Some implementations described herein relate to a decomposition chamber with a dividing tube where reductant is provided. The exhaust gas is propelled into the dividing tube, mixed with the reductant, swirled by the dividing tube, and provided out of the dividing tube. The dividing tube also includes ducts for guiding the exhaust gas into the dividing tube and a duct for guiding the exhaust gas across various surfaces of the dividing tube to mitigate impingement of reductant on those surfaces. 
     Some implementations described herein relate to a decomposition chamber with a transfer tube where reductant is provided. The exhaust gas is provided into the transfer tube on one side of a housing wall, mixed with the reductant, provided through the housing wall via the transfer tube, and provided from the transfer tube on the other side of the housing wall. 
     Implementations herein may provide exhaust gas radially (e.g., along tangents) into various bodies. By providing the exhaust gas radially, the exhaust gas may be caused to swirl within the various bodies. This utility of this swirl can be realized by injecting reductant into the exhaust gas and using this swirl to facilitate mixing of the reductant and the exhaust gas. Additionally, implementations herein may provide exhaust gas radially from various bodies (e.g., to catalyst members, etc.). By providing the exhaust gas radially, the momentum of the exhaust gas may be conserved and a pressure drop experienced by the exhaust gas may be decreased. 
     II. Example Exhaust Gas Aftertreatment System 
       FIG.  1    depicts an exhaust gas aftertreatment system  100  having an example reductant delivery system  102  for an exhaust gas conduit system  104 . The exhaust gas aftertreatment system  100  includes the reductant delivery system  102 , a particulate filter (e.g., a diesel particulate filter (DPF))  106 , a decomposition chamber  108  (e.g., decomposition reactor, reactor pipe, decomposition tube, reactor tube, etc.), and a selective catalytic reduction (SCR) catalyst member  110 . 
     The DPF  106  is configured to remove particulate matter, such as soot, from exhaust gas flowing in the exhaust gas conduit system  104 . The DPF  106  includes an inlet, where the exhaust gas is received, and an outlet, where the exhaust gas exits after having particulate matter substantially filtered from the exhaust gas and/or converting the particulate matter into carbon dioxide. In some implementations, the DPF  106  may be omitted. 
     The decomposition chamber  108  is configured to convert a reductant into ammonia. The reductant may be, for example, urea, diesel exhaust fluid (DEF), Adblue®, a urea water solution (UWS), an aqueous urea solution (e.g., AUS32, etc.), and other similar fluids. The decomposition chamber  108  includes an inlet fluidly coupled to (e.g., fluidly configured to communicate with, etc.) the DPF  106  to receive the exhaust gas containing NO x  emissions and an outlet for the exhaust gas, NO x  emissions, ammonia, and/or reductant to flow to the SCR catalyst member  110 . 
     The reductant delivery system  102  includes a dosing module  112  (e.g., doser, etc.) configured to dose the reductant into the decomposition chamber  108  (e.g., via an injector). The dosing module  112  is mounted to the decomposition chamber  108  such that the dosing module  112  may dose the reductant into the exhaust gas flowing in the exhaust gas conduit system  104 . The dosing module  112  may include an insulator interposed between a portion of the dosing module  112  and the portion of the decomposition chamber  108  on which the dosing module  112  is mounted. 
     The dosing module  112  is fluidly coupled to a reductant source  114 . The reductant source  114  may include multiple reductant sources  114 . The reductant source  114  may be, for example, a diesel exhaust fluid tank containing Adblue®. A reductant pump  116  (e.g., supply unit, etc.) is used to pressurize the reductant from the reductant source  114  for delivery to the dosing module  112 . In some embodiments, the reductant pump  116  is pressure controlled (e.g., controlled to obtain a target pressure, etc.). The reductant pump  116  includes a reductant filter  118 . The reductant filter  118  filters (e.g., strains, etc.) the reductant prior to the reductant being provided to internal components (e.g., pistons, vanes, etc.) of the reductant pump  116 . For example, the reductant filter  118  may inhibit or prevent the transmission of solids (e.g., solidified reductant, contaminants, etc.) to the internal components of the reductant pump  116 . In this way, the reductant filter  118  may facilitate (e.g., allow, permit, etc.) prolonged desirable operation of the reductant pump  116 . In some embodiments, the reductant pump  116  is coupled to a chassis of a vehicle associated with the exhaust gas aftertreatment system  100 . 
     The dosing module  112  includes at least one injector  120 . Each injector  120  is configured to dose the reductant into the exhaust gas (e.g., within the decomposition chamber  108 , etc.). In some embodiments, the reductant delivery system  102  also includes an air pump  122 . In these embodiments, the air pump  122  draws air from an air source  124  (e.g., air intake, etc.) and through an air filter  126  disposed upstream of the air pump  122 . Additionally, the air pump  122  provides the air to the dosing module  112  via a conduit. In these embodiments, the dosing module  112  is configured to mix the air and the reductant into an air-reductant mixture and to provide the air-reductant mixture into the decomposition chamber  108 . In other embodiments, the reductant delivery system  102  does not include the air pump  122  or the air source  124 . In such embodiments, the dosing module  112  is not configured to mix the reductant with air. 
     The dosing module  112  and the reductant pump  116  are also electrically or communicatively coupled to a reductant delivery system controller  128 . The reductant delivery system controller  128  is configured to control the dosing module  112  to dose the reductant into the decomposition chamber  108 . The reductant delivery system controller  128  may also be configured to control the reductant pump  116 . 
     The reductant delivery system controller  128  includes a processing circuit  130 . The processing circuit  130  includes a processor  132  and a memory  134 . The processor  132  may include a microprocessor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), etc., or combinations thereof. The memory  134  may include, but is not limited to, electronic, optical, magnetic, or any other storage or transmission device capable of providing a processor, ASIC, FPGA, etc. with program instructions. This memory  134  may include a memory chip, Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), flash memory, or any other suitable memory from which the reductant delivery system controller  128  can read instructions. The instructions may include code from any suitable programming language. The memory  134  may include various modules that include instructions which are configured to be implemented by the processor  132 . 
     In various embodiments, the reductant delivery system controller  128  is configured to communicate with a central controller  136  (e.g., engine control unit (ECU)), engine control module (ECM), etc.) of an internal combustion engine having the exhaust gas aftertreatment system  100 . In some embodiments, the central controller  136  and the reductant delivery system controller  128  are integrated into a single controller. 
     In some embodiments, the central controller  136  is communicable with a display device (e.g., screen, monitor, touch screen, heads up display (HUD), indicator light, etc.). The display device may be configured to change state in response to receiving information from the central controller  136 . For example, the display device may be configured to change between a static state (e.g., displaying a green light, displaying a “SYSTEM OK” message, etc.) and an alarm state (e.g., displaying a blinking red light, displaying a “SERVICE NEEDED” message, etc.) based on a communication from the central controller  136 . By changing state, the display device may provide an indication to a user (e.g., operator, etc.) of a status (e.g., operation, in need of service, etc.) of the reductant delivery system  102 . 
     The decomposition chamber  108  is located upstream of the SCR catalyst member  110 . As a result, the reductant is injected by the injector  120  upstream of the SCR catalyst member  110  such that the SCR catalyst member  110  receives a mixture of the reductant and exhaust gas. The reductant droplets undergo the processes of evaporation, thermolysis, and hydrolysis to form non-NO x  emissions (e.g., gaseous ammonia, etc.) within the decomposition chamber  108  and/or the exhaust gas conduit system  104 . 
     The SCR catalyst member  110  is configured to assist in the reduction of NO x  emissions by accelerating a NO x  reduction process between the reductant and the NO x  of the exhaust gas into diatomic nitrogen, water, and/or carbon dioxide. The SCR catalyst member  110  includes an inlet fluidly coupled to the decomposition chamber  108  from which exhaust gas and reductant are received and an outlet fluidly coupled to an end of the exhaust gas conduit system  104 . 
     The exhaust gas aftertreatment system  100  may further include an oxidation catalyst (e.g., a diesel oxidation catalyst (DOC)) fluidly coupled to the exhaust gas conduit system  104  (e.g., downstream of the SCR catalyst member  110  or upstream of the DPF  106 ) to oxidize hydrocarbons and carbon monoxide in the exhaust gas. 
     In some implementations, the DPF  106  may be positioned downstream of the decomposition chamber  108 . For instance, the DPF  106  and the SCR catalyst member  110  may be combined into a single unit. In some implementations, the dosing module  112  may instead be positioned downstream of a turbocharger or upstream of a turbocharger. 
     While the exhaust gas aftertreatment system  100  has been shown and described in the context of use with a diesel internal combustion engine, it is understood that the exhaust gas aftertreatment system  100  may be used with other internal combustion engines, such as gasoline internal combustion engines, hybrid internal combustion engines, propane internal combustion engines, and other similar internal combustion engines. 
     III. Example Decomposition Chamber 
       FIG.  2    illustrates an exploded view of the decomposition chamber  108  according to an example embodiment. The decomposition chamber  108  includes a communication assembly  200  (e.g., inlet/outlet assembly, etc.). The communication assembly  200  includes an inlet fitting  202  (e.g., connector, coupling, etc.). The inlet fitting  202  is configured to receive the exhaust gas from a portion of the exhaust gas conduit system  104  that is downstream of the DPF  106  and upstream of the decomposition chamber  108 . The communication assembly  200  also includes an inlet tube  204 . The inlet tube  204  is coupled to (e.g., attached to, fixed to, welded to, integrated with, etc.) the inlet fitting  202  and configured to receive the exhaust gas from the inlet fitting  202 . The communication assembly  200  also includes an outlet fitting  206  (e.g., connector, coupling, etc.). The outlet fitting  206  is configured to provide the exhaust gas from the decomposition chamber  108  and into a portion of the exhaust gas conduit system  104  that is downstream of the decomposition chamber  108  and upstream of the SCR catalyst member  110 . The communication assembly  200  also includes an outlet communicator  208 . The outlet communicator  208  is coupled to the outlet fitting  206  and configured to provide the exhaust gas to the outlet fitting  206 . The communication assembly  200  also includes a communication assembly housing wall  212  (e.g., panel, body, etc.). The inlet tube  204  and the outlet communicator  208  are each coupled to the communication assembly housing wall  212 . 
     The decomposition chamber  108  also includes a transfer assembly  214  (e.g., exchange assembly, etc.). The transfer assembly  214  includes at least one SCR catalyst member  216  (e.g., member, pipe, channel, etc.). Each SCR catalyst member  216  is coupled to the outlet communicator  208  and configured to provide the exhaust gas to the outlet communicator  208 . Similar to the SCR catalyst member  110 , each SCR catalyst member  216  is configured to assist in the reduction of NO x  emissions by accelerating a NO x  reduction process between the reductant and the NO x  of the exhaust gas into diatomic nitrogen, water, and/or carbon dioxide. 
     Each SCR catalyst member  216  is also coupled to a transfer assembly housing wall  218  (e.g., panel, body, etc.). For example, the transfer assembly housing wall  218  may include a plurality of apertures, each SCR catalyst member  216  coupled to the transfer assembly housing wall  218  around (e.g., about, along, etc.) one of the apertures and along a length of the SCR catalyst member  216  (e.g., as opposed to at an end of the SCR catalyst member  216 , etc.). In this way, the SCR catalyst member  216  provides the exhaust gas through the transfer assembly housing wall  218 . In an example embodiment, the transfer assembly  214  includes five SCR catalyst members  216 . In other embodiments, the transfer assembly  214  includes one, two, three, four, six, eight, ten, or other numbers of SCR catalyst members  216 . The transfer assembly  214  includes a transfer assembly inlet tube aperture  220  (e.g., hole, opening, etc.) in the transfer assembly housing wall  218 . The transfer assembly inlet tube aperture  220  is configured to receive the inlet tube  204  such that the inlet tube  204  protrudes through the transfer assembly housing wall  218 . The inlet tube  204  is coupled to the transfer assembly housing wall  218  around the transfer assembly inlet tube aperture  220 . 
     The decomposition chamber  108  also includes a mixing assembly  222  (e.g., treatment assembly, decomposition assembly, etc.). The mixing assembly  222  includes a mixing collector  224 . The mixing collector  224  is configured to provide the exhaust gas to each SCR catalyst member  216 . The mixing collector  224  is coupled to a mixing collector wall  226  (e.g., panel, body, etc.) of the mixing collector  224 . The mixing collector wall  226  includes a mixing collector wall aperture  227  (e.g., hole, opening, etc.). The mixing collector wall aperture  227  is configured to facilitate flow of the exhaust from the mixing collector  224  to the SCR catalyst members  216 . 
     The mixing assembly  222  includes a mixing assembly inlet tube aperture  228  (e.g., hole, opening, etc.) in the mixing collector wall  226 . The mixing assembly inlet tube aperture  228  is configured to receive the inlet tube  204  such that the inlet tube  204  protrudes through the mixing collector wall  226 . The inlet tube  204  is coupled to the mixing collector wall  226  around the mixing assembly inlet tube aperture  228 . 
     The mixing assembly  222  also includes a mixing assembly wall  230  (e.g., panel, body, etc.) and an outer housing wall  232  (e.g., panel, body, etc.). The mixing assembly wall  230  is coupled to the mixing collector wall  226 . For example, the mixing assembly wall  230  may be coupled to the mixing collector wall  226  along a perimeter of the mixing collector wall  226 . Similarly, the mixing assembly wall  230  is coupled to the outer housing wall  232 . For example, the mixing assembly wall  230  may be coupled to the outer housing wall  232  along a perimeter of the outer housing wall  232 . The mixing assembly  222  also includes an injector coupler  234 . The injector coupler  234  is coupled to the mixing assembly wall  230  and/or the outer housing wall  232 . The injector coupler  234  is configured to be coupled to the injector  120  and/or the dosing module  112  and to facilitate injection of the reductant through the mixing assembly wall  230  and/or the outer housing wall  232 . 
     The decomposition chamber  108  also includes a housing body  236  (e.g., wall, panel, etc.). The housing body  236  is coupled to the communication assembly housing wall  212 , the transfer assembly housing wall  218 , the mixing collector wall  226 , and the mixing assembly wall  230 . For example, the housing body  236  may be coupled to the communication assembly housing wall  212  around a perimeter of the communication assembly housing wall  212 , to the transfer assembly housing wall  218  around a perimeter of the transfer assembly housing wall  218 , to the mixing collector wall  226  around a perimeter of the mixing collector wall  226 , and to the mixing assembly wall  230  along an edge of the mixing assembly wall  230 . The housing body  236  includes an inlet fitting aperture  238  (e.g., hole, opening, etc.) and an outlet fitting aperture  240  (e.g., hole, opening, etc.). The inlet fitting aperture  238  is configured to receive the inlet fitting  202  such that the inlet fitting  202  protrudes through the housing body  236  and the outlet fitting aperture  240  is configured to receive the outlet fitting  206  such that the outlet fitting  206  protrudes through the housing body  236 . The housing body  236  is coupled to the inlet fitting  202  around the inlet fitting aperture  238  and to the outlet fitting  206  around the outlet fitting aperture  240 . 
     In operation, exhaust gas enters the inlet fitting  202 , flows through the housing body  236  via the inlet fitting aperture  238 , and flows into the inlet tube  204 . The exhaust gas traverses the transfer assembly housing wall  218  and the mixing collector wall  226  through the inlet tube  204  and flows into a cavity (e.g., a mixing assembly cavity, etc.) defined between the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232 . Reductant is inserted via the injector coupler  234  and mixed with the exhaust gas within the cavity. The exhaust gas then flows into the mixing collector  224 . The exhaust gas is provided through the mixing collector wall  226  via the mixing collector  224  and provided into the SCR catalyst members  216 . The SCR catalyst members  216  facilitate passage of the exhaust gas through the transfer assembly housing wall  218  and into the outlet communicator  208 . The exhaust gas then flows from the outlet communicator  208  into the outlet fitting  206 , flows through the housing body  236  via the outlet fitting aperture  240 , and flows out of the decomposition chamber  108 . 
     IV. Example Decomposition Chamber Having a First Example Mixing Assembly 
       FIGS.  3 - 5    illustrate the decomposition chamber  108  and the mixing assembly  222  according to an example embodiment. The decomposition chamber  108  includes a distribution cap  300  coupled to the inlet tube  204 . The distribution cap  300  may interface with, or be coupled to the mixing collector wall  226 . The distribution cap  300  includes at least one distribution cap aperture  302  disposed on a distribution cap wall  304 . As the exhaust gas flows out of the inlet tube  204 , the exhaust gas first flows into the distribution cap  300 , rather than flowing directly into the cavity defined between the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232 . The exhaust gas exits the distribution cap  300  via the distribution cap aperture  302 . 
     In various embodiments, the distribution cap  300  includes a plurality of distribution cap apertures  302 . For example, the distribution cap  300  may include three, five, six, eight, ten, twelve, or other numbers of distribution cap apertures  302 . The distribution cap apertures  302  may be uniformly disposed along the distribution cap wall  304 . In some embodiments, each of the distribution cap apertures  302  is identical (e.g., has the same diameter, etc.). The number, shape, and size of the distribution cap apertures  302  can be selected so as to direct flow in a target manner. 
     After flowing out of the distribution cap  300  via the distribution cap aperture  302 , the exhaust gas flows into a concentration cavity  306  defined between the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , the outer housing wall  232 , a first concentration wall  308  (e.g., panel, etc.), and a second concentration wall  310  (e.g., panel, etc.). The first concentration wall  308  and the second concentration wall  310  are each coupled to the mixing collector wall  226  and the outer housing wall  232 . 
     The concentration cavity  306  has an annular portion  311  extending around the distribution cap  300  and generally formed between the distribution cap wall  304  and one of the first concentration wall  308  or the second concentration wall  310 . The concentration cavity  306  also has a throat portion  312  (e.g., hourglass shaped portion, converging portion, etc.) formed between the first concentration wall  308  and the second concentration wall  310 . As the exhaust gas flows out from the distribution cap aperture  302 , the velocity of the exhaust gas increases as it flows towards the throat portion  312 . A first width of the concentration cavity  306  in the throat portion  312  is less than a second width of the concentration cavity  306  outside of the throat portion  312  (e.g., proximate the distribution cap  300 , etc.). In various embodiments, the width of the concentration cavity  306  gradually decreases from the distribution cap  300  to the throat portion  312 . 
     The injector coupler  234  is coupled to the outer housing wall  232  rather than the mixing assembly wall  230 . The injector coupler  234  is coupled to the outer housing wall  232 . In operation, reductant is provided by the injector  120  and/or the dosing module  112  into an injection region  314 . In various embodiments, the injector coupler  234  is positioned along the outer housing wall  232  so as to position the injection region  314  near a junction (e.g., cross-over, border, etc.) between the annular portion  311  and the throat portion  312 . As a result, the injection region  314  is immediately upstream of the throat portion  312 . The injector coupler  234  may be located such that the reductant is dispersed into the exhaust gas at a location (e.g., immediately upstream of the throat portion  312 , etc.) where the velocity of the exhaust gas is relatively high. As a result, impingement of the reductant (e.g., accumulation of reductant deposits, formation of a wall film, etc.) on the mixing collector wall  226  is minimized. By minimizing impingement of the reductant, the decomposition chamber  108  is capable of operating for a prolonged period of time between servicing (e.g., cleaning, etc.) or replacement. In other embodiments, the injector coupler  234  is configured such that the injection region  314  is located at a location other than near the junction between the annular portion  311  and the throat portion  312 . 
     After flowing out of the throat portion  312 , the exhaust flows into a first swirl cavity  316  and a second swirl cavity  318 . The first swirl cavity  316  is defined between the mixing collector wall  226 , the outer housing wall  232 , the first concentration wall  308 , a splitting wall  320 , and a first swirl wall  322 . Similarly, the second swirl cavity  318  is defined between the mixing collector wall  226 , the outer housing wall  232 , the first concentration wall  308 , the splitting wall  320 , and a second swirl wall  324 . 
     The first concentration wall  308  is coupled to the mixing collector wall  226 , the outer housing wall  232 , the splitting wall  320 , and the first swirl wall  322  (e.g., such that flow of the exhaust gas between the first concentration wall  308  and the mixing collector wall  226  is substantially prohibited, such that flow of the exhaust gas between the first concentration wall  308  and the outer housing wall  232  is substantially prohibited, such that flow of the exhaust gas between the first concentration wall  308  and the splitting wall  320  is substantially prohibited, such that flow of the exhaust gas between the first concentration wall  308  and the first swirl wall  322  is substantially prohibited, etc.). When flow between two elements is “substantially prohibited,” it is understood that the transfer of fluid between the two elements may be entirely prohibited or that the transfer of only a de minimus amount of the fluid (e.g., 5%, etc.) between the two elements is permitted. 
     The second concentration wall  310  is coupled to the mixing collector wall  226 , the outer housing wall  232 , the splitting wall  320 , and the second swirl wall  324  (e.g., such that flow of the exhaust gas between the second concentration wall  310  and the mixing collector wall  226  is substantially prohibited, such that flow of the exhaust gas between the second concentration wall  310  and the outer housing wall  232  is substantially prohibited, such that flow of the exhaust gas between the second concentration wall  310  and the splitting wall  320  is substantially prohibited, such that flow of the exhaust gas between the second concentration wall  310  and the second swirl wall  324  is substantially prohibited, etc.). 
     The splitting wall  320  is coupled to the mixing collector wall  226 , the outer housing wall  232 , the first concentration wall  308 , the second concentration wall  310 , the first swirl wall  322 , and the second swirl wall  324  (e.g., such that flow of the exhaust gas between the splitting wall  320  and the mixing collector wall  226  is substantially prohibited, such that flow of the exhaust gas between the splitting wall  320  and the outer housing wall  232  is substantially prohibited, such that flow of the exhaust gas between the splitting wall  320  and the first concentration wall  308  is substantially prohibited, such that flow of the exhaust gas between the splitting wall  320  and the second concentration wall  310  is substantially prohibited, such that flow of the exhaust gas between the splitting wall  320  and the first swirl wall  322  is substantially prohibited, such that flow of the exhaust gas between the splitting wall  320  and the second swirl wall  324  is substantially prohibited, etc.). 
     The first swirl wall  322  is coupled to the mixing collector wall  226 , the outer housing wall  232 , the splitting wall  320 , and the first concentration wall  308  (e.g., such that flow of the exhaust gas between the first swirl wall  322  and the mixing collector wall  226  is substantially prohibited, such that flow of the exhaust gas between the first swirl wall  322  and the outer housing wall  232  is substantially prohibited, such that flow of the exhaust gas between the first swirl wall  322  and the splitting wall  320  is substantially prohibited, such that flow of the exhaust gas between the first swirl wall  322  and the first concentration wall  308  is substantially prohibited, etc.). 
     The second swirl wall  324  is coupled to the mixing collector wall  226 , the outer housing wall  232 , the splitting wall  320 , and the second concentration wall  310  (e.g., such that flow of the exhaust gas between the second swirl wall  324  and the mixing collector wall  226  is substantially prohibited, such that flow of the exhaust gas between the second swirl wall  324  and the outer housing wall  232  is substantially prohibited, such that flow of the exhaust gas between the second swirl wall  324  and the splitting wall  320  is substantially prohibited, such that flow of the exhaust gas between the second swirl wall  324  and the second concentration wall  310  is substantially prohibited, etc.). 
     The splitting wall  320  includes a splitting face  326 , a first swirl face  328 , and a second swirl face  330 . In various embodiments, the splitting wall  320  is symmetrical about a plane bisecting the splitting face  326  such that the first swirl face  328  is identical to the second swirl face  330 . As is explained in more detail herein, the splitting wall  320  divides the flow of the exhaust gas into the first swirl cavity  316  and the second swirl cavity  318  such that a uniformity index (UI) of the reductant and exhaust gas and a flow distribution index of the exhaust gas are both increased, thereby increasing the desirability of the decomposition chamber  108  (e.g., compared to other decomposition chambers, etc.). 
     After flowing through the throat portion  312 , the exhaust gas may flow against (e.g., into, etc.) the splitting face  326 . The splitting face  326  is curved (e.g., rounded, convex, etc.) towards the throat portion  312  such that the exhaust gas is caused to split (e.g., be divided, etc.). As a result of this split, a portion of the exhaust gas flows towards the first swirl face  328  and a portion of the exhaust gas flows towards the second swirl face  330 . The first swirl face  328  and the second swirl face  330  are each curved (e.g., concave, etc.) such that the exhaust gas flowing along the first swirl face  328  is propelled into the first swirl cavity  316  (e.g., away from the second swirl cavity  318 , etc.) and the exhaust gas flowing along the second swirl face  330  is propelled into the second swirl cavity  318  (e.g., away from the first swirl cavity  316 , etc.). In addition to splitting the exhaust gas between the first swirl cavity  316  and the second swirl cavity  318 , the splitting wall  320  also functions to prevent flow of the exhaust gas from the throat portion  312 , where the exhaust gas has relatively high velocity, directly onto the mixing assembly wall  230 . In this way, impingement of reductant on the mixing assembly wall  230  may be decreased. Additionally, impingement of reductant on the splitting wall  320  is minimized due to the rounded shape of the splitting face  326 , the first swirl face  328 , and the second swirl face  330 . 
     The mixing collector wall  226  includes a first mixing assembly flow aperture  332  (e.g., hole, opening, etc.) positioned between the first swirl wall  322  and the first concentration wall  308  and a second mixing assembly flow aperture  334  (e.g., hole, opening, etc.) positioned between the second swirl wall  324  and the second concentration wall  310 . After flowing along the first swirl face  328 , the exhaust gas is caused to flow between the splitting wall  320  and the first concentration wall  308 , along a first corner portion  336  of the splitting wall  320 , and then between the first concentration wall  308  and the first swirl wall  322  and into the first mixing assembly flow aperture  332 . The first mixing assembly flow aperture  332  and the second mixing assembly flow aperture  334  collectively function as the mixing collector wall aperture  227 . Similarly, after flowing along the second swirl face  330 , the exhaust gas is caused to flow between the splitting wall  320  and the second concentration wall  310 , along a second corner portion  338  of the splitting wall  320 , and then between the second concentration wall  310  and the second swirl wall  324  and into the second mixing assembly flow aperture  334 . The first concentration wall  308 , the first corner portion  336 , the first swirl wall  322 , the second concentration wall  310 , the second corner portion  338 , and the second swirl wall  324  are each generally curved such that impingement of reductant (e.g., formation of deposits of reductant, etc.) is minimized and such that backpressure of the decomposition chamber  108  (e.g., on the internal combustion engine, etc.) is minimized. The first mixing assembly flow aperture  332  and the second mixing assembly flow aperture  334  are each positioned so as to be at least partially aligned with at least one SCR catalyst member  216 . Minimizing backpressure increases the desirability of the decomposition chamber  108  (e.g., compared to other decomposition chambers, etc.) because efficiency and/or performance characteristics (e.g., power, torque, etc.) of an internal combustion engine having the exhaust gas aftertreatment system  100  is increased. 
     In various embodiments, the distribution cap  300 , the distribution cap aperture  302 , the first concentration wall  308 , the second concentration wall  310 , the splitting wall  320 , the first swirl wall  322 , and the second swirl wall  324  are configured such that the concentration cavity  306  is symmetric about an axis bisecting the concentration cavity  306  and such that the first swirl cavity  316  is a mirror of the second swirl cavity  318 . As a result of this configuration, flow of the exhaust gas through the mixing assembly  222  is optimized and mixing (e.g., dispersion, etc.) of reductant in the exhaust gas is enhanced. By increasing mixing of the reductant in the exhaust gas, the UI of the exhaust gas is increased. 
     In some embodiments, the first concentration wall  308  includes at least one first concentration wall bleed aperture  340  (e.g., hole, opening, etc.) and the second concentration wall  310  includes at least one second concentration wall bleed aperture  342  (e.g., hole, opening, etc.). The first concentration wall bleed aperture  340  facilitates passage of the exhaust gas through the first concentration wall  308  and directly into the first mixing assembly flow aperture  332 . Similarly, the second concentration wall bleed aperture  342  facilitates passage of the exhaust gas through the second concentration wall  310  and directly into the second mixing assembly flow aperture  334 . In this way, the first concentration wall bleed aperture  340  and the second concentration wall bleed aperture  342  facilitate bypassing of the throat portion  312 , the first swirl cavity  316 , and the second swirl cavity  318  by a portion of the exhaust gas flowing into the first mixing assembly flow aperture  332  and the second mixing assembly flow aperture  334 . As a result, the backpressure of the decomposition chamber  108  may be decreased. 
     In some embodiments, as shown in  FIG.  4   , the decomposition chamber  108  further includes a first perforated cylinder  400  and a second perforated cylinder  402 . The first perforated cylinder  400  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first perforated cylinder  400  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  around the first mixing assembly flow aperture  332  (e.g., such that flow of the exhaust gas between the first perforated cylinder  400  and the mixing collector wall  226  is substantially prohibited, etc.). Similarly, the second perforated cylinder  402  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second perforated cylinder  402  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  around the second mixing assembly flow aperture  334  (e.g., such that flow of the exhaust gas between the second perforated cylinder  402  and the mixing collector wall  226  is substantially prohibited, etc.). 
     The first perforated cylinder  400  includes a plurality of first perforated cylinder perforations  404  (e.g., holes, openings, apertures, etc.). In operation, the exhaust gas flows from the first swirl cavity  316  through the first perforated cylinder perforations  404  into the first perforated cylinder  400 , and through the first mixing assembly flow aperture  332 . As the exhaust gas flows through the first perforated cylinder perforations  404 , a flow of the exhaust gas is straightened (e.g., turbulence of the exhaust gas is reduced, etc.). As a result, the backpressure of the decomposition chamber  108  may be decreased. Additionally, the first perforated cylinder perforations  404  cause a deceleration of a rotational velocity of the exhaust gas flowing along the first perforated cylinder  400 . As a result, reductant within the exhaust gas flowing around the first perforated cylinder  400  is propelled towards the first swirl wall  322 , the first concentration wall  308 , and the splitting wall  320  which increases mixing of the reductant in the exhaust gas proximate the first perforated cylinder  400 . This reduced rotational velocity of the exhaust gas also facilitates increased diffusion of the reductant in the exhaust gas proximate the first perforated cylinder  400 . Furthermore, the first perforated cylinder perforations  404  create micro-eddies (e.g., turbulence, etc.) downstream of the first perforated cylinder perforations  404  and within the first perforated cylinder  400 . These micro-eddies further increase mixing of the reductant and the exhaust gas. 
     Similarly, the second perforated cylinder  402  includes a plurality of second perforated cylinder perforations  406  (e.g., holes, openings, apertures, etc.). In operation, the exhaust gas flows from the second swirl cavity  318  through the second perforated cylinder perforations  406  into the second perforated cylinder  402 , and through the second mixing assembly flow aperture  334 . As the exhaust gas flows through the second perforated cylinder perforations  406 , a flow of the exhaust gas is straightened (e.g., turbulence of the exhaust gas is reduced, etc.). As a result, the backpressure of the decomposition chamber  108  may be decreased. Additionally, the second perforated cylinder perforations  406  cause a deceleration of a rotational velocity of the exhaust gas flowing along the second perforated cylinder  402 . As a result, reductant within the exhaust gas flowing around the second perforated cylinder  402  is propelled towards the second swirl wall  324 , the second concentration wall  310 , and the splitting wall  320  which increases mixing of the reductant in the exhaust gas proximate the second perforated cylinder  402 . This reduced rotational velocity of the exhaust gas also facilitates increased diffusion of the reductant in the exhaust gas proximate the second perforated cylinder  402 . Furthermore, the second perforated cylinder perforations  406  create micro-eddies (e.g., turbulence, etc.) downstream of the second perforated cylinder perforations  406  and within the second perforated cylinder  402 . These micro-eddies further increase mixing of the reductant and the exhaust gas. 
     In some embodiments, as shown in  FIG.  5   , the outer housing wall  232  includes an injector coupling recess  500  that is recessed (e.g., inset, etc.) in the outer housing wall  232  and the mixing collector wall  226  includes an injection region recess  502  that is recessed in the mixing collector wall  226 . The injector coupling recess  500  is configured to receive the injector coupler  234  such that the injector coupler  234  may be coupled to the outer housing wall  232  without protruding substantially from the outer housing wall  232 . In this way, the space claim of the decomposition chamber  108  may be decreased. The injection region recess  502  is configured to contain at least a portion of the injection region  314 . Through the injection region recess  502 , impingement is decreased because a distance between the injector coupler  234  and the mixing collector wall  226  is maintained despite the injector coupling recess  500 . In some embodiments, the injector coupling recess  500  is defined by a first recess distance (e.g., relative to the outer housing wall  232 , etc.) and the injection region recess  502  is defined by a second recess distance (e.g., relative to the mixing collector wall  226  that is substantially equal to (e.g., within 5% of, etc.) the first recess distance. In some embodiments, the first recess distance and the second recess distance are each equal to substantially 35 millimeters (mm) (e.g., within 5% of 35 mm, etc.). In various applications, the first recess distance and/or the second recess distance are between 1 mm and 90 mm, inclusive. In other applications, the first recess distance and/or the second recess distance are between 20 mm and 90 mm, inclusive. In some embodiments, the first recess distance and the second recess distance are each equal and are each less than or equal to substantially 50.8 mm (e.g., within 5% of 50.8 mm, etc.). 
     V. Example Decomposition Chamber Having a Second Example Mixing Assembly 
       FIG.  6    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a flow guide  600 . As is explained in more detail herein, the flow guide  600  divides the exhaust gas into a first concentration cavity  602  and a second concentration cavity  604 . The flow guide  600  includes a first splitting wall  606 . The first splitting wall  606  includes a first splitting face  608 , a first concentrating face  610 , and a second concentrating face  612 . The flow guide  600  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the flow guide  600  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the flow guide  600  and the mixing collector wall  226  is substantially prohibited, etc.). 
     After the exhaust gas flows out of the distribution cap aperture  302 , the exhaust gas flows into either the first concentration cavity  602  defined between the first concentrating face  610 , the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232  or the second concentration cavity  604  defined between the second concentrating face  612 , the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232 . The first splitting face  608  is curved (e.g., rounded, convex, etc.) towards the distribution cap  300  such that the exhaust gas is caused to split (e.g., be divided, etc.). As a result of this split, a portion of the exhaust gas flows towards the first concentrating face  610  and a portion of the exhaust gas flows towards the second concentrating face  612 . 
     As the exhaust gas flows within the first concentration cavity  602 , the exhaust gas flows along a first concentration wall  614  (e.g., between the first concentration wall  614  and the mixing assembly wall  230 , etc.) of the flow guide  600  and towards a second splitting wall  616  of the flow guide  600 . Similarly, as the exhaust gas flows within the second concentration cavity  604 , the exhaust gas flows along a second concentration wall  622  (e.g., between the first concentration wall  614  and the mixing assembly wall  230 , etc.) of the flow guide  600  and towards the second splitting wall  616 . The second splitting wall  616  includes a second splitting face  624 , a first swirl face  626 , and a second swirl face  628 . 
     The exhaust gas flows into either a first swirl cavity  630  defined between the first concentration wall  614 , the first swirl face  626 , the mixing collector wall  226 , and the outer housing wall  232  or a second swirl cavity  632  defined between the second concentration wall  622 , the second swirl face  628 , the mixing collector wall  226 , and the outer housing wall  232 . The second splitting face  624  is curved (e.g., rounded, convex, etc.) towards the mixing assembly wall  230  such that the exhaust gas is caused to split (e.g., be divided, etc.). As a result of this split, a portion of the exhaust gas flows towards the first swirl face  626  and a portion of the exhaust gas flows towards the second swirl face  628 . 
     As the exhaust gas flows within the first swirl cavity  630 , the exhaust gas flows along the first swirl face  626  and the first concentration wall  614  and towards the first mixing assembly flow aperture  332 . Similarly, as the exhaust gas flows within the second swirl cavity  632 , the exhaust gas flows along the second swirl face  628  and the second concentration wall  622  and towards the second mixing assembly flow aperture  334 . 
     The mixing assembly wall  230  includes an injector coupling recess  634  that is configured to receive the injector coupler  234 . The injector coupler  234  is coupled to the injector coupling recess  634 . The injector coupling recess  634  extends into a region between the first concentration cavity  602  and the second concentration cavity  604  and aligned with the second splitting face  624 . As such, the injection region  314  disposed at a junction between the first concentration cavity  602 , the second concentration cavity  604 , the first swirl cavity  630 , and the second swirl cavity  632 . Due to the relatively high velocity of the exhaust gas within the first concentration cavity  602 , the second concentration cavity  604 , the first swirl cavity  630 , and the second swirl cavity  632 , impingement of the reductant on the second splitting wall  616 , the first concentration wall  614 , and the second concentration wall  622  is minimized. 
     The injector coupling recess  634  is configured to receive the injector coupler  234  such that the injector coupler  234  may be coupled to the mixing assembly wall  230  without protruding substantially from the mixing assembly wall  230 . In this way, the space claim of the decomposition chamber  108  may be decreased. 
     The decomposition chamber  108  also includes a first corner wall  636  (e.g., flange, wall, etc.). The first corner wall  636  is coupled to the mixing collector wall  226  and the outer housing wall  232 . The first corner wall  636  is disposed adjacent a first corner of the mixing assembly wall  230  proximate the first mixing assembly flow aperture  332 . The first corner wall  636  extends away from the first corner and along the mixing assembly wall  230  towards the distribution cap  300 . The first corner wall  636  may extend around a portion of the first concentration wall  614 . The first corner wall  636  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a first gap distance. In some embodiments, the first gap distance is constant along the first corner wall  636 . In various embodiments, the first gap distance is less than 10 mm. The first gap distance provides thermal insulation, thereby mitigating heat transfer from the first corner wall  636  and maintaining the first corner wall  636  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The decomposition chamber  108  also includes a second corner wall  638  (e.g., flange, wall, etc.). The second corner wall  638  is coupled to the mixing collector wall  226  and the outer housing wall  232 . The second corner wall  638  is disposed adjacent a second corner of the mixing assembly wall  230  proximate the second mixing assembly flow aperture  334 . The second corner wall  638  extends away from the second corner and along the mixing assembly wall  230  towards the distribution cap  300 . The second corner wall  638  may extend around a portion of the second concentration wall  622 . The second corner wall  638  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a second gap distance. In some embodiments, the second gap distance is constant along the second corner wall  638 . In various embodiments, the second gap distance is less than 10 mm. In some embodiments, the second gap distance is approximately equal to the first gap distance. In some embodiments, the second corner wall  638  is an identical reflection of the first corner wall  636 . The second gap distance provides thermal insulation, thereby mitigating heat transfer from the second corner wall  638  and maintaining the second corner wall  638  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     In some embodiments, the first splitting wall  606  includes an aperture and the second splitting wall  616  includes an aperture. As a result, the exhaust gas may flow from the distribution cap aperture  302  through the aperture in the first splitting wall  606 , through the aperture in the second splitting wall  616 , and into the injection region  314  without flowing through the first concentration cavity  602  or the second concentration cavity  604 . This exhaust gas disrupts the spray of reductant, increases convective heat transfer to the sprayed reductant, and increases decomposition of the reductant (which correspondingly decreases a likelihood of impingement of the reductant, and increases uniformity index). 
     In some embodiments, the first splitting wall  606  and the second splitting wall  616  are each perforated such that exhaust gas may flow from the distribution cap aperture  302  through the first splitting wall  606 , through the second splitting wall  616 , and into the injection region  314  without flowing through the first concentration cavity  602  or the second concentration cavity  604 . This exhaust gas disrupts the spray of reductant, increases convective heat transfer to the sprayed reductant, and increases decomposition of the reductant (which correspondingly decreases a likelihood of impingement of the reductant, and increases uniformity index). 
     VI. Example Decomposition Chamber Having a Third Example Mixing Assembly 
       FIGS.  7 A and  7 B  illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a first channel wall  700  coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first channel wall  700  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first channel wall  700  and the outer housing wall  232  is substantially prohibited, etc.), the distribution cap wall  304  (e.g., such that flow of the exhaust gas between the first channel wall  700  and the distribution cap wall  304  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the first channel wall  700  and the mixing assembly wall  230  is substantially prohibited, etc.). 
     The decomposition chamber  108  also includes a second channel wall  702  coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second channel wall  702  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second channel wall  702  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the second channel wall  702  and the mixing assembly wall  230  is substantially prohibited, etc.). 
     The first channel wall  700  and the second channel wall  702  collectively form a channel cavity  706 . The channel cavity  706  originates at the distribution cap  300  and terminates at a mixing assembly flow aperture  708  (e.g., hole, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  708  functions as the mixing collector wall aperture  227 . In various embodiments, the mixing assembly flow aperture  708  is substantially centered relative to the SCR catalyst member  216 . For example, the mixing assembly flow aperture  708  may be located on the mixing collector wall  226  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the mixing assembly flow aperture  708  may increase the FDI and the UI of the exhaust gas. 
     The decomposition chamber  108  also includes a first corner wall  707  and a second corner wall  709 . The first corner wall  707  is located proximate a first corner of the mixing assembly wall  230  and the second corner wall  709  is located proximate a second corner of the mixing assembly wall  230 . The first corner wall  707  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first corner wall  707  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first corner wall  707  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the first corner wall  707  and the mixing assembly wall  230  is substantially prohibited, etc.). The first corner wall  707  is coupled to the mixing assembly wall  230  at a first end of the first corner wall  707  and at a second end of the first corner wall  707 , but is separated from the mixing assembly wall  230  between the first end of the first corner wall  707  and the second end of the first corner wall  707 . The second corner wall  709  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second corner wall  709  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second corner wall  709  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the second corner wall  709  and the mixing assembly wall  230  is substantially prohibited, etc.). The second corner wall  709  is coupled to the mixing assembly wall  230  at a first end of the second corner wall  709  and at a second end of the second corner wall  709 , but is separated from the mixing assembly wall  230  between the first end of the second corner wall  709  and the second end of the second corner wall  709 . 
     The first corner wall  707  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a first gap distance. In some embodiments, the first gap distance is constant along the first corner wall  707 . In various embodiments, the first gap distance is less than 10 mm. The first gap distance provides thermal insulation, thereby mitigating heat transfer from the first corner wall  707  and maintaining the first corner wall  707  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The second corner wall  709  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a second gap distance. In some embodiments, the second gap distance is constant along the second corner wall  709 . In various embodiments, the second gap distance is less than 10 mm. In some embodiments, the second gap distance is approximately equal to the first gap distance. In some embodiments, the second corner wall  709  is an identical reflection of the first corner wall  707 . The second gap distance provides thermal insulation, thereby mitigating heat transfer from the second corner wall  709  and maintaining the second corner wall  709  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas is directed into the second channel wall  702  by the first channel wall  700  and a first flow guide  710  (e.g., vane, wall, partition, etc.). The first flow guide  710  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first flow guide  710  and the mixing collector wall  226  is substantially prohibited, etc.) and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first flow guide  710  and the outer housing wall  232  is substantially prohibited, etc.). The first flow guide  710  has a curvature that generally matches a curvature of an adjacent portion of the first corner wall  707 . The exhaust gas flows between the first flow guide  710  and the first corner wall  707  and between the first flow guide  710  and the second channel wall  702  (e.g., the first flow guide  710  divides the exhaust gas as the exhaust gas flows towards the mixing assembly flow aperture  708 , etc.). 
     After flowing past the first flow guide  710 , the exhaust gas is directed into the mixing assembly flow aperture  708  by a second flow guide  712  (e.g., vane, wall, partition, divider, etc.). The second flow guide  712  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second flow guide  712  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second flow guide  712  and the outer housing wall  232  is substantially prohibited, etc.), and the second corner wall  709  (e.g., such that flow of the exhaust gas between the second corner wall  709  and the second flow guide  712  is substantially prohibited, etc.). The exhaust gas flows between the second flow guide  712  and the second corner wall  709  and then between the second flow guide  712  and the second channel wall  702 . Additionally, the exhaust gas flows between the second flow guide  712  and the second channel wall  702  (e.g., the second flow guide  712  divides the exhaust gas as the exhaust gas flows towards the mixing assembly flow aperture  708 , etc.). 
     The second channel wall  702  partially borders the mixing assembly flow aperture  708  such that the exhaust gas can only flow into the mixing assembly flow aperture  708  after first flowing between the second flow guide  712  and the second channel wall  702 . The first flow guide  710  and the second flow guide  712  cooperate to reduce turbulence (e.g., noise, etc.) of the exhaust gas, reduce backpressure of the decomposition chamber  108 , and to increase the FDI and the UI of the exhaust gas. 
     The first channel wall  700  is heated by the exhaust gas flowing out of the distribution cap  300  (e.g., prior to the exhaust gas flowing between the second channel wall  702  and the distribution cap wall  304 , etc.). This heating mitigates impingement of the reductant on the first channel wall  700 . 
     In various embodiments, the first channel wall  700  includes a plurality of perforations  714  (e.g., holes, openings, apertures, etc.). The perforations  714  enable the exhaust gas to pass directly through the first channel wall  700  without flowing around the distribution cap wall  304 . The exhaust gas that passes through the perforations  714  functions to flush wall film off of the first channel wall  700 , thereby mitigating impingement of the reductant on the first channel wall  700  and enabling the backpressure of the decomposition chamber  108  to be decreased. 
     Similar to the decomposition chamber  108  described in  FIG.  5   , the injector coupler  234  is coupled to the mixing assembly wall  230  in  FIGS.  7 A and  7 B . Specifically, the injector coupler  234  is coupled to the mixing assembly wall  230  between the second channel wall  702  and the distribution cap wall  304  and such that the injection region  314  is located between the second channel wall  702  and the distribution cap wall  304 . 
     The decomposition chamber  108  also includes at least one baffle  716  (e.g., flap, fin, vane, etc.). Each baffle  716  may be coupled to the distribution cap  300  (e.g., to the distribution cap wall  304 , etc.), the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the baffle  716  and the mixing collector wall  226  is substantially prohibited, etc.), and/or the outer housing wall  232  (e.g., such that flow of the exhaust gas between the baffle  716  and the outer housing wall  232  is substantially prohibited, etc.). The baffle  716  is located proximate (e.g., underneath, etc.) the injection region  314 . For example, the baffle  716  may be located between the injection region  314  and the distribution cap wall  304 . The baffle  716  functions to both direct exhaust gas towards the mixing assembly flow aperture  708  and mitigate impingement of the reductant on the distribution cap wall  304 . 
     The first channel wall  700 , the second channel wall  702 , the first flow guide  710 , and the second flow guide  712  may each be angled (e.g., tilted, etc.) relative to the mixing collector wall  226  (e.g., angled at an angle other than 90° relative to the mixing collector wall  226 , etc.). This angling may increase flow area, thereby decreasing the backpressure of the decomposition chamber  108 . For example, each of the first channel wall  700 , the second channel wall  702 , the first flow guide  710 , and the second flow guide  712  are angled between 100° and 130°, inclusive, relative to the mixing collector wall  226 , in some embodiments. As shown in  FIGS.  7 A and  7 B , the second channel wall  702  and the second flow guide  712  are angled. In some embodiments, none of the first channel wall  700 , the second channel wall  702 , the first flow guide  710 , and the second flow guide  712  are angled relative to the mixing collector wall  226  (e.g., each of the first channel wall  700 , the second channel wall  702 , the first flow guide  710 , and the second flow guide  712  are angled 90° relative to the mixing collector wall  226 ). 
     The decomposition chamber  108  also includes a third flow guide  718  (e.g., vane, wall, partition, divider, etc.). The third flow guide  718  is coupled to the second channel wall  702  and extends towards the distribution cap wall  304  (e.g., proximate the baffle  716 , etc.). The third flow guide  718  functions to break up turbulence between the mixing collector wall  226  and the outer housing wall  232  and guides the exhaust gas and reductant between the second channel wall  702  and the distribution cap wall  304  towards the first channel wall  700 . Additionally, the third flow guide  718  may function to mitigate impingement of the reductant on the mixing collector wall  226 . While reductant may contact the third flow guide  718 , exhaust gas flows above and below the third flow guide  718 . This exhaust gas heats the third flow guide  718 , potentially causing the reductant contacting the third flow guide  718  to vaporize, and also biases the reductant off of the third flow guide  718 . In various embodiments, the third flow guide  718  is disposed on a plane that is substantially parallel to a plane upon which the mixing collector wall  226  is disposed. The third flow guide  718  may at least partially bisect the injection region  314 . In some embodiments, the decomposition chamber  108  does not include the third flow guide  718 . 
     VII. Example Decomposition Chamber Having a Fourth Example Mixing Assembly 
       FIGS.  8 - 12    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  800 . The dividing tube  800  includes a dividing tube body  802  (e.g., frame, shell, etc.). The dividing tube body  802  is generally cylindrical (e.g., tubular, etc.). In various embodiments, the dividing tube body  802  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  802  and the mixing assembly wall  230  is substantially prohibited, etc.), the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  802  and the mixing collector wall  226  is substantially prohibited, etc.), and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  802  and the outer housing wall  232  is substantially prohibited, etc.). 
     The dividing tube  800  separates a concentration cavity  804  from a transfer cavity  806 . The concentration cavity  804  is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , and the dividing tube body  802 . The transfer cavity  806  is defined between the mixing collector wall  226 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  802 , and a mixing assembly flow aperture  808  (e.g., hole, opening, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  808  functions as the mixing collector wall aperture  227 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the concentration cavity  804  and enters the dividing tube  800  via a first dividing tube inlet aperture  812  (e.g., hole, opening, etc.) or a second dividing tube inlet aperture  814  (e.g., hole, opening, etc.). The first dividing tube inlet aperture  812  is located proximate a first end  813  of the dividing tube body  802  that interfaces with and/or is coupled to the mixing assembly wall  230  and the second dividing tube inlet aperture  814  is located proximate a second end  815  of the dividing tube body  802  that interfaces with and/or is coupled to the mixing assembly wall  230  opposite the first end  813 . The first end  813  and/or the second end  815  may include tabs (e.g., projections, etc.) that are configured to be received within slots (e.g., holes, openings, apertures, etc.) within the mixing assembly wall  230  to facilitate coupling of the dividing tube  800  to the mixing assembly wall  230 . 
     The dividing tube body  802  also includes a first duct  816  (e.g., cowl, hood, etc.) and a second duct  818  (e.g., cowl, hood, etc.). The first duct  816  is contiguous with, and extends over, the first dividing tube inlet aperture  812 . The first duct  816  extends towards the concentration cavity  804  such that the first duct  816  functions to direct the exhaust gas into the first dividing tube inlet aperture  812 . Similarly, the second duct  818  is contiguous with, and extends over, the second dividing tube inlet aperture  814 . The second duct  818  extends also extends towards the concentration cavity  804  such that the second duct  818  functions to direct the exhaust gas into the second dividing tube inlet aperture  814 . 
     After flowing through the first dividing tube inlet aperture  812  or the second dividing tube inlet aperture  814 , the exhaust gas enters a dividing tube cavity  820 . At least a portion of the first dividing tube inlet aperture  812 , at least a portion of the first duct  816 , at least a portion of the second dividing tube inlet aperture  814 , and at least a portion of the second duct  818  are located proximate the outer housing wall  232 . As a result, the exhaust gas enters the dividing tube cavity  820  radially (e.g., along a tangent of the dividing tube body  802 , along a line that is parallel to and offset from a tangent of the dividing tube body  802 , etc.) after flowing through the first dividing tube inlet aperture  812  or the second dividing tube inlet aperture  814 . This radial entry causes the exhaust gas to swirl within the dividing tube cavity  820 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  800  is positioned such that the second end  815  is disposed around (e.g., circumscribes, borders, etc.) the injector coupler  234 . As a result, the injection region  314  is located within the dividing tube cavity  820 . The swirl imparted by the first dividing tube inlet aperture  812 , the first duct  816 , the second dividing tube inlet aperture  814 , and the second duct  818  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  820  and ensures shear on the dividing tube body  802  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  802 . 
     The exhaust gas exits the dividing tube cavity  820  via a dividing tube outlet aperture  822  and flows into the transfer cavity  806 . From the transfer cavity  806 , the exhaust gas flows through the mixing assembly flow aperture  808  and towards the SCR catalyst member  216 . In various embodiments, the mixing assembly flow aperture  808  is substantially centered relative to the SCR catalyst member  216 . For example, the mixing assembly flow aperture  808  may be located on the mixing collector wall  226  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the mixing assembly flow aperture  808  may increase the FDI and the UI of the exhaust gas. 
     The dividing tube outlet aperture  822  is positioned between the first dividing tube inlet aperture  812  and the second dividing tube inlet aperture  814 . Therefore, the dividing tube outlet aperture  822  does not overlap either the first dividing tube inlet aperture  812  or the second dividing tube inlet aperture  814 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the first dividing tube inlet aperture  812  to the dividing tube outlet aperture  822  or from the second dividing tube inlet aperture  814  to the dividing tube outlet aperture  822  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  822  is first swirled by the dividing tube body  802 . As a result, the dividing tube  800  increases mixing of the reductant in the exhaust gas and the FDI and the UI of the exhaust gas. 
     The dividing tube body  802  also includes a third duct  824  (e.g., cowl, hood, etc.). The third duct  824  is contiguous with, and extends over, the dividing tube outlet aperture  822 . The third duct  824  extends towards the transfer cavity  806  such that the third duct  824  functions to direct the exhaust gas towards the mixing assembly flow aperture  808 . In some embodiments, the third duct  824  extends over the mixing assembly flow aperture  808 . The exhaust gas exits the dividing tube cavity  820  radially after flowing through the dividing tube outlet aperture  822 . This radial exit propels the exhaust gas into the mixing assembly flow aperture  808 , thereby minimizing backpressure of the decomposition chamber  108 . 
     In various embodiments, the mixing collector wall  226  also includes a dividing tube coupling aperture  826  (e.g., hole, opening, etc.). The dividing tube coupling aperture  826  is configured to receive a portion of the dividing tube body  802 . The dividing tube body  802  is coupled to the mixing collector wall  226  around the dividing tube coupling aperture  826  (e.g., such that flow of the exhaust gas between the dividing tube body  802  and the mixing collector wall  226  is substantially prohibited, etc.). As a result, a plane along which the mixing collector wall  226  is disposed bisects the dividing tube cavity  820  such that a first portion of the dividing tube cavity  820  is located on one side of the mixing collector wall  226  and a second portion of the dividing tube cavity  820  is located on another side of the mixing collector wall  226 . As a result of this arrangement, a diameter of the dividing tube  800  can be increased without increasing a distance between the mixing collector wall  226  and the outer housing wall  232 , thereby enabling a space claim of the decomposition chamber  108  to be minimized. By increasing the diameter of the dividing tube  800 , the UI can be enhanced. 
     In various embodiments, the outer housing wall  232  includes one or more rounded walls  828 . Each of the rounded walls  828  may be configured to receive a portion of one of the first duct  816 , the second duct  818 , or the third duct  824 . Each of the rounded walls  828  may terminate upstream and/or downstream of the first duct  816 , the second duct  818 , or the third duct  824 , so as to function as an extension of the first duct  816 , the second duct  818 , or the third duct  824  and thereby functioning to propel, rather than impede, flow of the exhaust gas into and/or out of the dividing tube cavity  820 . Similar to the dividing tube coupling aperture  826 , the rounded walls  828  enable the diameter of the dividing tube  800  to be increased without substantially increasing a space claim of the decomposition chamber  108 . 
     In various embodiments, the dividing tube body  802  includes a shield  830  (e.g., wall, projection, etc.). The shield  830  is contiguous with the second dividing tube inlet aperture  814  and extends into the dividing tube cavity  820  and towards the transfer cavity  806  (e.g., the shield  830  is bent inward relative to the dividing tube body  802 , etc.). The shield  830  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  820  via the second dividing tube inlet aperture  814 . 
     In various embodiments, the dividing tube body  802  also includes a fourth duct  832  (e.g., cowl, hood, etc.). Unlike the first duct  816 , the second duct  818 , and the third duct  824 , the fourth duct  832  does not function to direct the exhaust gas into the dividing tube cavity  820  or out of the dividing tube cavity  820 . Instead, the fourth duct  832  functions to direct the exhaust gas from upstream of the dividing tube  800 , across the third duct  824 , and downstream of the dividing tube  800 . By flowing exhaust gas across the third duct  824 , the temperature of the third duct  824  is increased. By increasing the temperature of the third duct  824 , impingement of the reductant on the third duct  824  is minimized. In these embodiments, a rounded wall  828  may be configured to receive a portion of the fourth duct  832 . This rounded wall  828  may terminate upstream and/or downstream of the fourth duct  832 , thereby functioning to propel, rather than impede, flow of the exhaust gas into or out of the fourth duct  832 . 
     In various embodiments, the dividing tube body  802  also includes a plurality of dividing tube body perforations  834  (e.g., apertures, holes, etc.). The dividing tube body perforations  834  are disposed on an upstream surface of the dividing tube body  802  (e.g., adjacent the concentration cavity  804 , etc.). In some embodiments, at least some of the dividing tube body perforations  834  are located between the first dividing tube inlet aperture  812  and the second dividing tube inlet aperture  814  and/or aligned with the dividing tube outlet aperture  822 . In operation, the dividing tube body perforations  834  facilitate passage of the exhaust gas through the dividing tube body  802  and into the dividing tube cavity  820  without passing through the first dividing tube inlet aperture  812  or the second dividing tube inlet aperture  814 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube body perforations  834  functions to heat the dividing tube body  802 , thereby mitigating impingement of the reductant on the dividing tube body  802 . By aligning at least some of the dividing tube body perforations  834  with the dividing tube outlet aperture  822 , the exhaust gas flowing within the dividing tube cavity  820  may be propelled out of the dividing tube outlet aperture  822 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In some embodiments, such as is shown in  FIG.  9 B , the mixing collector wall  226  also includes a bellmouth lip  900  (e.g., rounded lip, curved lip, etc.). The bellmouth lip  900  extends along the mixing assembly flow aperture  808  and curved away from the mixing collector wall  226  towards the transfer assembly housing wall  218  and towards the mixing assembly wall  230 . The bellmouth lip  900  may increase rigidity of the mixing collector wall  226  and improve flow separation of the exhaust gas proximate the bellmouth lip  900  (e.g., along an edge of the mixing assembly flow aperture  808 , etc.). 
     VIII. Example Decomposition Chamber Having a Fifth Example Mixing Assembly 
       FIGS.  13 - 17    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  1300 . The dividing tube  1300  includes a dividing tube body  1302  (e.g., frame, shell, etc.) and a dividing tube flange  1303  (e.g., wall, divider, etc.). The dividing tube body  1302  is generally cylindrical. In various embodiments, the dividing tube body  1302  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  1302  and the mixing assembly wall  230  is substantially prohibited, etc.), the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  1302  and the mixing collector wall  226  is substantially prohibited, etc.), and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  1302  and the outer housing wall  232  is substantially prohibited, etc.). 
     The dividing tube  1300  separates a concentration cavity  1304  from a transfer cavity  1306 . The concentration cavity  1304  is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  1302 , and the dividing tube flange  1303 . The transfer cavity  1306  is defined between the mixing collector wall  226 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  1302 , the dividing tube flange  1303 , and a mixing assembly flow aperture  1308  (e.g., hole, opening, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  1308  functions as the mixing collector wall aperture  227 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the concentration cavity  1304  and enters the dividing tube  1300  via a dividing tube inlet aperture  1310  (e.g., hole, opening, etc.). The dividing tube body  1302  includes a first end  1309  and a second end  1311  opposite the first end  1309 . The first end  1309  interfaces with and/or is coupled to the dividing tube flange  1303 . The second end  1311  interfaces with and/or is coupled to the mixing assembly wall  230 . The dividing tube inlet aperture  1310  is located proximate the second end  1311 . The first end  1309  may include tabs that are configured to be received within slots within the dividing tube flange  1303  to facilitate coupling of the dividing tube  1300  to the dividing tube flange  1303 . The second end  1311  may include tabs that are configured to be received within slots within the mixing assembly wall  230  to facilitate coupling of the dividing tube  1300  to the mixing assembly wall  230 . 
     The dividing tube body  1302  also includes a first duct  1312  (e.g., cowl, hood, etc.). The first duct  1312  is contiguous with, and extends over, the dividing tube inlet aperture  1310 . The first duct  1312  extends towards the concentration cavity  1304  such that the first duct  1312  functions to direct the exhaust gas into the dividing tube inlet aperture  1310 . 
     After flowing through the dividing tube inlet aperture  1310 , the exhaust gas enters a dividing tube cavity  1314 . At least a portion of the dividing tube inlet aperture  1310  and at least a portion of the first duct  1312  are located proximate the outer housing wall  232 . As a result, the exhaust gas enters the dividing tube cavity  1314  radially (e.g., along a tangent of the dividing tube body  1302 , along a line that is parallel to and offset from a tangent of the dividing tube body  1302 , etc.) after flowing through the dividing tube inlet aperture  1310 . This radial entry causes the exhaust gas to swirl within the dividing tube cavity  1314 . The swirl imparted by the dividing tube inlet aperture  1310  and the first duct  1312  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  1314  and ensures shear on the dividing tube body  1302  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  1302 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  1300  is positioned such that the injector coupler  234  is received in an injector mount receiver  1316  in the second end  1311 . As a result, the injection region  314  is located within the dividing tube cavity  1314 . 
     The exhaust gas exits the dividing tube cavity  1314  via a dividing tube outlet aperture  1318  and flows into the transfer cavity  1306 . From the transfer cavity  1306 , the exhaust gas flows through the mixing assembly flow aperture  1308  and towards the SCR catalyst member  216 . In various embodiments, the mixing assembly flow aperture  1308  is substantially centered relative to the SCR catalyst member  216 . For example, the mixing assembly flow aperture  1308  may be located on the mixing collector wall  226  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the mixing assembly flow aperture  1308  may increase the FDI and the UI of the exhaust gas. 
     The dividing tube outlet aperture  1318  is positioned proximate the first end  1309 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  1310  to the dividing tube outlet aperture  1318  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  1318  is first swirled by the dividing tube body  1302 . Furthermore, due to the dividing tube inlet aperture  1310  being positioned proximate the second end  1311  and the dividing tube outlet aperture  1318  being positioned proximate the first end  1309 , a distance between the dividing tube inlet aperture  1310  and the dividing tube outlet aperture  1318  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  1314  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The dividing tube body  1302  also includes a second duct  1320  (e.g., cowl, hood, etc.). The second duct  1320  is contiguous with, and extends over, the dividing tube outlet aperture  1318 . The second duct  1320  extends towards the transfer cavity  1306  such that the second duct  1320  functions to direct the exhaust gas towards the mixing assembly flow aperture  1308 . In some embodiments, the second duct  1320  extends over the mixing assembly flow aperture  1308 . The exhaust gas exits the dividing tube cavity  1314  radially after flowing through the dividing tube outlet aperture  1318 . This radial exit propels the exhaust gas into the mixing assembly flow aperture  1308 , thereby minimizing backpressure of the decomposition chamber  108 . 
     In various embodiments, the mixing collector wall  226  also includes a dividing tube coupling aperture  1322  (e.g., hole, opening, etc.). The dividing tube coupling aperture  1322  is configured to receive a portion of the dividing tube body  1302 . The dividing tube body  1302  is coupled to the mixing collector wall  226  around the dividing tube coupling aperture  1322  (e.g., such that flow of the exhaust gas between the dividing tube body  1302  and the mixing collector wall  226  is substantially prohibited, etc.). As a result, a plane along which the mixing collector wall  226  is disposed bisects the dividing tube cavity  1314  such that a first portion of the dividing tube cavity  1314  is located on one side of the mixing collector wall  226  and a second portion of the dividing tube cavity  1314  is located on another side of the mixing collector wall  226 . As a result of this arrangement, a diameter of the dividing tube  1300  can be increased without increasing a distance between the mixing collector wall  226  and the outer housing wall  232 , thereby enabling a space claim of the decomposition chamber  108  to be minimized. By increasing the diameter of the dividing tube  1300 , the UI of the exhaust gas can be increased. 
     In various embodiments, the outer housing wall  232  includes one or more rounded walls  1324 . Each of the rounded walls  1324  may be configured to receive a portion of one of the first duct  1312  or the second duct  1320 . Each of the rounded walls  1324  may terminate upstream and/or downstream of the first duct  1312  or the second duct  1320 , so as to function as an extension of the first duct  1312  or the second duct  1320  and thereby functioning to propel, rather than impede, flow of the exhaust gas into and/or out of the dividing tube cavity  1314 . Similar to the dividing tube coupling aperture  1322 , the rounded walls  1324  enable the diameter of the dividing tube  1300  to be increased without substantially increasing a space claim of the decomposition chamber  108 . 
     In various embodiments, the dividing tube body  1302  includes a shield  1326  (e.g., wall, projection, etc.). The shield  1326  is contiguous with the dividing tube inlet aperture  1310  and extends into the dividing tube cavity  1314  and towards the transfer cavity  1306  (e.g., the shield  1326  is bent inward relative to the dividing tube body  1302 , etc.). The shield  1326  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  1314  via the dividing tube inlet aperture  1310 . 
     In various embodiments, the dividing tube body  1302  also includes a third duct  1328  (e.g., cowl, hood, etc.). Unlike the first duct  1312  and the second duct  1320 , the third duct  1328  does not function to direct the exhaust gas into the dividing tube cavity  1314  or out of the dividing tube cavity  1314 . Instead, the third duct  1328  functions to direct the exhaust gas from upstream of the dividing tube  1300 , across the second duct  1320 , and downstream of the dividing tube  1300 . By flowing exhaust gas across the second duct  1320 , the temperature of the second duct  1320  is increased. By increasing the temperature of the second duct  1320 , impingement of the reductant on the second duct  1320  is minimized. In these embodiments, a rounded wall  1324  may be configured to receive a portion of the third duct  1328 . This rounded wall  1324  may terminate upstream and/or downstream of the third duct  1328 , thereby functioning to propel, rather than impede, flow of the exhaust gas into or out of the third duct  1328 . 
     In various embodiments, the dividing tube body  1302  also includes a plurality of dividing tube body perforations  1330  (e.g., apertures, holes, etc.). The dividing tube body perforations  1330  are disposed on an upstream surface of the dividing tube body  1302  (e.g., adjacent the concentration cavity  1304 , etc.). In some embodiments, at least some of the dividing tube body perforations  1330  are aligned with the dividing tube outlet aperture  1318 . In operation, the dividing tube body perforations  1330  facilitate passage of the exhaust gas through the dividing tube body  1302  and into the dividing tube cavity  1314  without passing through the dividing tube inlet aperture  1310 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube body perforations  1330  functions to heat the dividing tube body  1302 , thereby mitigating impingement of the reductant on the dividing tube body  1302 . By aligning at least some of the dividing tube body perforations  1330  with the dividing tube outlet aperture  1318 , the exhaust gas flowing within the dividing tube cavity  1314  may be propelled out of the dividing tube outlet aperture  1318 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the dividing tube flange  1303  includes a plurality of dividing tube flange tube perforations  1332  (e.g., apertures, holes, etc.). The dividing tube flange tube perforations  1332  are disposed on a portion of the dividing tube flange  1303  that is opposite the dividing tube cavity  1314  (e.g., are located opposite the first end  1309 , etc.). In operation, the dividing tube flange tube perforations  1332  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  1303 , etc.) through the dividing tube flange  1303  and into the dividing tube cavity  1314  without passing through the dividing tube inlet aperture  1310  or the dividing tube body perforations  1330 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange tube perforations  1332  functions to heat the first end  1309 , thereby mitigating impingement of the reductant on the first end  1309 . The exhaust gas flowing through the dividing tube flange tube perforations  1332  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  1314  towards the dividing tube outlet aperture  1318 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the dividing tube flange  1303  includes a plurality of dividing tube flange transfer perforations  1334  (e.g., apertures, holes, etc.). The dividing tube flange transfer perforations  1334  are disposed on a portion of the dividing tube flange  1303  that is not opposite the dividing tube cavity  1314  (e.g., are located downstream of the dividing tube body  1302 , etc.). Instead, the dividing tube flange transfer perforations  1334  are disposed on a portion of the dividing tube flange  1303  that is opposite the transfer cavity  1306  (e.g., that is opposite the mixing assembly flow aperture  1308 , etc.). In operation, the dividing tube flange transfer perforations  1334  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  1303 , etc.) through the dividing tube flange  1303  and into the transfer cavity  1306  without passing through the dividing tube body  1302 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange transfer perforations  1334  functions to heat the dividing tube flange  1303 , thereby mitigating impingement of the reductant on the dividing tube flange  1303  (e.g., the portion of the dividing tube flange  1303  that is downstream of the dividing tube outlet aperture  1318 , etc.). The exhaust gas flowing through the dividing tube flange transfer perforations  1334  may also be useful in redirecting the exhaust gas flowing within the transfer cavity  1306  towards the mixing assembly flow aperture  1308 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     IX. Example Decomposition Chamber Having a Sixth Example Mixing Assembly 
       FIGS.  18 - 22    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a transfer tube  1800 . The transfer tube  1800  includes a transfer tube body  1802  (e.g., frame, shell, etc.). The transfer tube body  1802  is generally tubular and is configured to facilitate passage of the exhaust gas from between the outer housing wall  232  and the mixing collector wall  226  to between the mixing collector wall  226  and the transfer assembly housing wall  218 . 
     The mixing collector wall  226  includes an transfer tube coupling aperture  1804 . The transfer tube body  1802  is coupled to the mixing collector wall  226  around the transfer tube coupling aperture  1804  (e.g., such that flow of the exhaust gas between the transfer tube body  1802  and the mixing collector wall  226  is substantially prohibited, etc.). The transfer tube body  1802  is also coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the transfer tube body  1802  and the mixing assembly wall  230  is substantially prohibited, etc.). 
     The transfer tube  1800  includes a transfer tube inlet portion  1806 , a transfer tube transfer portion  1808 , and a transfer tube outlet portion  1810 . The transfer tube inlet portion  1806  is coupled to the mixing assembly wall  230  and positioned entirely between the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232 . The transfer tube transfer portion  1808  extends through the transfer tube coupling aperture  1804  and is coupled to the mixing collector wall  226 . The transfer tube outlet portion  1810  is positioned entirely between the mixing collector wall  226 , the housing body  236 , and the transfer assembly housing wall  218 . As is explained in more detail herein, the transfer tube inlet portion  1806 , the transfer tube transfer portion  1808 , and the transfer tube outlet portion  1810  are configured to cooperate to provide the exhaust gas from between the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232  to between the mixing collector wall  226 , the housing body  236 , and the transfer assembly housing wall  218 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas flows between the mixing collector wall  226 , the outer housing wall  232 , and the mixing assembly wall  230 . The exhaust gas flows into the transfer tube inlet portion  1806  via a plurality of transfer tube inlet portion perforations  1814  (e.g., holes, apertures, openings, etc.). In various embodiments, at least some of the transfer tube inlet portion perforations  1814  are disposed proximate an end  1816  of the transfer tube  1800 . 
     The transfer tube inlet portion perforations  1814  are positioned so as to collectively cause the exhaust gas to swirl within the transfer tube inlet portion  1806 . For example, some of the transfer tube inlet portion perforations  1814  may be disposed along a portion of the transfer tube inlet portion  1806  that is proximate the outer housing wall  232  and the end  1816 . The swirl imparted by the transfer tube inlet portion perforations  1814  facilitates mixing of the exhaust gas and the reductant within the transfer tube  1800  and ensures shear on the transfer tube body  1802  is relatively high, thereby mitigating impingement of the reductant on the transfer tube body  1802 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The transfer tube  1800  is positioned such that the injector coupler  234  is positioned adjacent the end  1816 . The end  1816  includes an injector aperture  1818  (e.g., hole, opening, etc.). The injector aperture  1818  is configured to receive the injector  120 , the dosing module  112 , and/or the reductant provided by the injector  120  and/or the dosing module  112 . As a result, the injection region  314  is located within the transfer tube inlet portion  1806 . 
     The exhaust gas within the transfer tube inlet portion  1806  is configured to mix with the exhaust (e.g., due to the swirl provided by the positioning of the transfer tube inlet portion perforations  1814 , etc.) provided through the injector aperture  1818 . The exhaust gas then flows through the transfer tube inlet portion  1806  across the mixing collector wall  226  and to the transfer tube transfer portion  1808 . By facilitating flow of the exhaust gas across the mixing collector wall  226 , the transfer tube inlet portion  1806  lengthens an amount of time that the exhaust gas and the reductant are mixed, thereby increasing the FDI and the UI of the exhaust gas. 
     The transfer tube transfer portion  1808  receives the exhaust gas from the transfer tube inlet portion  1806  and routes the exhaust gas through the mixing collector wall  226  and to the transfer tube outlet portion  1810 . The transfer tube transfer portion  1808  may be generally U-shaped so as to lengthen the amount of time that the exhaust gas and the reductant are mixed, facilitate flow attachment of the exhaust gas as the exhaust gas traverses the transfer tube transfer portion  1808 , and mitigate impingement of the reductant on the transfer tube transfer portion  1808 . 
     The transfer tube outlet portion  1810  receives the exhaust gas from the transfer tube transfer portion  1808  and routes the exhaust gas across the mixing collector wall  226  (e.g., opposite the transfer tube inlet portion  1806 , etc.). By facilitating flow of the exhaust gas across the mixing collector wall  226 , the transfer tube outlet portion  1810  lengthens the amount of time that the exhaust gas and the reductant are mixed. 
     In various embodiments, the transfer tube outlet portion  1810  includes a transfer tube outlet portion aperture  1820 . The transfer tube outlet portion  1810  provides the exhaust gas through the transfer tube outlet portion aperture  1820  and between the mixing collector wall  226 , the housing body  236 , and the transfer assembly housing wall  218  so as to be received by each SCR catalyst member  216 . In this way, the transfer tube outlet portion aperture  1820  functions as the mixing collector wall aperture  227 . 
     In some embodiments, the transfer tube outlet portion aperture  1820  is substantially centered relative to the SCR catalyst member  216 . For example, the transfer tube outlet portion aperture  1820  may be located on the transfer tube outlet portion  1810  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the transfer tube outlet portion aperture  1820  may increase the FDI and the UI of the exhaust gas. 
     In various embodiments, a cross-sectional area of the transfer tube  1800  (e.g., relative to a general direction of flow of the exhaust gas through the transfer tube  1800 , etc.) is constant, or increases, from the end  1816  to a second end  1822  of the transfer tube  1800 . In various applications, the end  1816  has a first cross-sectional area, an inlet of the transfer tube transfer portion  1808  has a second cross-sectional area that is greater than or equal to the first cross-sectional area, an outlet of the transfer tube transfer portion  1808  has a third cross-sectional area that is greater than or equal to the second cross-sectional area, and the second end  1822  has a fourth cross-sectional area. In some of these applications, the fourth cross-sectional area is greater than or equal to the third cross-sectional area. In others of these applications, the fourth cross-sectional area is not greater than or equal to the third cross-sectional area. By maintaining or increasing the cross-sectional area along all or most of the length of the transfer tube  1800  from the end  1816  to the second end  1822 , the backpressure of the decomposition chamber  108  may be minimized. 
     In some embodiments, the mixing collector wall  226  includes a transfer tube recess  1824  that is configured to receive the transfer tube inlet portion  1806  and/or the transfer tube transfer portion  1808 . As a result of this arrangement, a diameter of the transfer tube  1800  can be increased without increasing a distance between the mixing collector wall  226  and the outer housing wall  232 , thereby enabling a space claim of the decomposition chamber  108  to be minimized. By increasing the diameter of the transfer tube  1800 , the UI of the exhaust gas can be increased. 
     In various embodiments, the transfer tube outlet portion  1810  includes a plurality of transfer tube outlet portion perforations  1826  (e.g., apertures, holes, openings, etc.) instead of, or in addition to, the transfer tube outlet portion aperture  1820 . Similar to the transfer tube outlet portion aperture  1820 , the exhaust gas exits the transfer tube outlet portion  1810  via the transfer tube outlet portion perforations  1826 . The transfer tube outlet portion perforations  1826  may be located on various surfaces of the transfer tube outlet portion  1810 . For example, the transfer tube outlet portion perforations  1826  may be located on a surface of the transfer tube outlet portion  1810  that is proximate the mixing collector wall  226 , a surface of the transfer tube outlet portion  1810  that is proximate the transfer assembly housing wall  218 , and/or on a surface of the transfer tube outlet portion  1810  that is proximate the housing body  236 . In some embodiments, the transfer tube outlet portion perforations  1826  are substantially centered relative to the SCR catalyst member  216 . For example, the transfer tube outlet portion perforations  1826  may be located on the transfer tube outlet portion  1810  so as to have a center (e.g., average location of the center points of each transfer tube outlet portion perforation  1826 , etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the transfer tube outlet portion perforations  1826  may increase the FDI and the UI of the exhaust gas. 
     In various embodiments, the transfer tube transfer portion  1808  includes a plurality of transfer tube transfer portion perforations  1828  (e.g., apertures, holes, openings, etc.) located on a surface of the transfer tube transfer portion  1808  that is between the mixing collector wall  226 , the housing body  236 , and the transfer assembly housing wall  218 . Similar to the transfer tube outlet portion perforations  1826 , the exhaust gas is capable of exiting the transfer tube transfer portion perforations  1828  (e.g., prior to the exhaust gas flowing into the transfer tube outlet portion  1810 , etc.). The transfer tube transfer portion perforations  1828  may decrease the backpressure of the decomposition chamber  108 . The transfer tube transfer portion perforations  1828  may be located on various surfaces of the transfer tube transfer portion  1808 . For example, the transfer tube transfer portion perforations  1828  may be located on a surface of the transfer tube transfer portion  1808  that is proximate the mixing collector wall  226 , a surface of the transfer tube transfer portion  1808  that is proximate the transfer assembly housing wall  218 , and/or on a surface of the transfer tube transfer portion  1808  that is proximate the housing body  236 . In some embodiments, at least some of the transfer tube transfer portion perforations  1828  are located on a transfer tube downstream surface  1830  located between the mixing collector wall  226 , the transfer assembly housing wall  218 , and the housing body  236 . By locating the transfer tube transfer portion perforations  1828  on the transfer tube downstream surface  1830 , the exhaust gas is propelled into the transfer tube transfer portion perforations  1828  by the U-shape of the transfer tube transfer portion  1808 , thereby decreasing the backpressure of the decomposition chamber  108  and mitigating impingement of reductant on the transfer tube downstream surface  1830 . 
     In various embodiments, the end  1816  includes a plurality of end perforations  1832  (e.g., apertures, holes, openings, etc.). Similar to the transfer tube inlet portion perforations  1814 , the end perforations  1832  receive the exhaust gas and provide the exhaust gas into the transfer tube inlet portion  1806 . However, unlike the transfer tube inlet portion perforations, the end perforations  1832  are arranged to propel the exhaust gas towards the transfer tube transfer portion  1808 . In addition to causing the exhaust gas received from the transfer tube inlet portion perforations  1814  to be propelled towards the transfer tube transfer portion  1808 , the end perforations  1832  also propel the reductant towards the transfer tube transfer portion  1808 , thereby enhancing mixing of the reductant and the exhaust gas within the transfer tube inlet portion  1806  and minimizing impingement of the reductant on the transfer tube inlet portion  1806 . 
     X. Example Decomposition Chamber Having a Seventh Example Mixing Assembly 
       FIG.  23    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a channel wall  2300  coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the channel wall  2300  and the mixing collector wall  226  is substantially prohibited, etc.), and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the channel wall  2300  and the outer housing wall  232  is substantially prohibited, etc.). In some embodiments, the channel wall  2300  is additionally coupled to the distribution cap wall  304  (e.g., such that flow of the exhaust gas between the channel wall  2300  and the distribution cap wall  304  is substantially prohibited, etc.). 
     The channel wall  2300  forms a channel cavity  2302 . The channel cavity  2302  originates at the distribution cap  300  and terminates at a mixing assembly flow aperture  2304  (e.g., hole, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  2304  functions as the mixing collector wall aperture  227 . 
     In various embodiments, the mixing assembly flow aperture  2304  is substantially centered relative to the SCR catalyst member  216 . For example, the mixing assembly flow aperture  2304  may be located on the mixing collector wall  226  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the mixing assembly flow aperture  2304  may increase the FDI and the UI of the exhaust gas. 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas may be directed into a first passage  2308  (e.g., passageway, channel, etc.) by the channel wall  2300 . Similar to the decomposition chamber  108  described in  FIG.  5   , the injector coupler  234  is coupled to the mixing assembly wall  230  in  FIG.  23   . Specifically, the injector coupler  234  is coupled to the mixing assembly wall  230  such that the injection region  314  is located at least partially within the first passage  2308  (e.g., the injector coupler  234  is located between parallel walls of the channel wall  2300 . The channel cavity  2302  includes the first passage  2308 , the second passage  2310 , and the third passage  2312 . 
     The exhaust gas and the reductant are mixed within the first passage  2308  and the exhaust is propelled from the first passage  2308  into a second passage  2310  (e.g., passageway, channel, etc.), from the second passage  2310  into a third passage  2312  (e.g., passageway, channel, etc.), and from the third passage  2312  into the mixing assembly flow aperture  2304 . The first passage  2308  and the second passage  2310  are separated by a bend (e.g., a right angle, etc.) that is configured to facilitate mixing of the exhaust gas and the reductant within the channel cavity  2302 . Similarly, the second passage  2310  and the third passage  2312  are separated by a bend (e.g., a right angle, etc.) that is configured to facilitate mixing of the exhaust gas and the reductant within the channel cavity  2302 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas may be directed into a fourth passage  2314  (e.g., passageway, channel, etc.) by the channel wall  2300 . The fourth passage  2314  extends around the distribution cap  300  and between the channel wall  2300  and the mixing assembly wall  230 . 
     The decomposition chamber  108  also includes a first corner wall  2316  and a second corner wall  2318 . The first corner wall  2316  is located proximate a first corner of the mixing assembly wall  230  and the second corner wall  2318  is located proximate a second corner of the mixing assembly wall  230 . The first corner wall  2316  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first corner wall  2316  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first corner wall  2316  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the first corner wall  2316  and the mixing assembly wall  230  is substantially prohibited, etc.). The first corner wall  2316  is coupled to the mixing assembly wall  230  at a first end of the first corner wall  2316  and at a second end of the first corner wall  2316 , but is separated from the mixing assembly wall  230  between the first end of the first corner wall  2316  and the second end of the first corner wall  2316 . The second corner wall  2318  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second corner wall  2318  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second corner wall  2318  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the second corner wall  2318  and the mixing assembly wall  230  is substantially prohibited, etc.). The second corner wall  2318  is coupled to the mixing assembly wall  230  at a first end of the second corner wall  2318  and at a second end of the second corner wall  2318 , but is separated from the mixing assembly wall  230  between the first end of the second corner wall  2318  and the second end of the second corner wall  2318 . 
     The first corner wall  2316  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a first gap distance. In some embodiments, the first gap distance is constant along the first corner wall  2316 . In various embodiments, the first gap distance is less than 10 mm. The first gap distance provides thermal insulation, thereby mitigating heat transfer from the first corner wall  2316  and maintaining the first corner wall  2316  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The second corner wall  2318  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a second gap distance. In some embodiments, the second gap distance is constant along the second corner wall  2318 . In various embodiments, the second gap distance is less than 10 mm. In some embodiments, the second gap distance is approximately equal to the first gap distance. In some embodiments, the second corner wall  2318  is an identical reflection of the first corner wall  2316 . The second gap distance provides thermal insulation, thereby mitigating heat transfer from the second corner wall  2318  and maintaining the second corner wall  2318  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The fourth passage  2314  extends between the first corner wall  2316  and the channel wall  2300  and between the second corner wall  2318  and the channel wall  2300 . The fourth passage  2314  finally extends into the first passage  2308 . 
     In various embodiments, the channel wall  2300  includes a plurality of channel wall apertures  2320  located in a portion of the channel wall  2300  that extends between the first corner wall  2316  and the second corner wall  2318 . As a result, exhaust gas may flow between the third passage  2312  and the fourth passage  2314  (e.g., from the third passage  2312  to the fourth passage  2314 , from the fourth passage  2314  to the third passage  2312 ). 
     XI. Example Decomposition Chamber Having an Eighth Example Mixing Assembly 
       FIG.  24    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a channel wall  2400  coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the channel wall  2400  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the channel wall  2400  and the outer housing wall  232  is substantially prohibited, etc.). In some embodiments, the channel wall  2400  is additionally coupled to the distribution cap wall  304  (e.g., such that flow of the exhaust gas between the channel wall  2400  and the distribution cap wall  304  is substantially prohibited, etc.). 
     The channel wall  2400  forms a channel cavity  2402 . The channel cavity  2402  originates at the distribution cap  300  and terminates at a mixing assembly flow aperture  2404  (e.g., hole, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  2404  functions as the mixing collector wall aperture  227 . Rather than being centered on the SCR catalyst member  216 , the mixing assembly flow aperture  2404  extends across the mixing collector wall  226 , thereby maximizing the area of the mixing assembly flow aperture  2404  and decreasing a backpressure of the decomposition chamber  108 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas may be directed into a first passage  2408  (e.g., passageway, channel, etc.) by the channel wall  2400 . Similar to the decomposition chamber  108  described in  FIG.  5   , the injector coupler  244  is coupled to the mixing assembly wall  230  in  FIG.  24   . Specifically, the injector coupler  244  is coupled to the mixing assembly wall  230  such that the injection region  314  is located at least partially within the first passage  2408  (e.g., the injector coupler  244  is located between parallel walls of the channel wall  2400 . 
     The exhaust gas and the reductant are mixed within the first passage  2408  and the exhaust is propelled from the first passage  2408  into a second passage  2410  (e.g., passageway, channel, etc.), from the second passage  2410  into a third passage  2412  (e.g., passageway, channel, etc.), and from the third passage  2412  into the mixing assembly flow aperture  2404 . The first passage  2408  and the second passage  2410  are separated by a bend (e.g., a right angle, etc.) that is configured to facilitate mixing of the exhaust gas and the reductant within the channel cavity  2402 . Similarly, the second passage  2410  and the third passage  2412  are separated by a bend (e.g., a right angle, etc.) that is configured to facilitate mixing of the exhaust gas and the reductant within the channel cavity  2402 . The channel cavity  2402  includes the first passage  2408 , the second passage  2410 , and the third passage  2412 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas may be directed into a fourth passage  2414  (e.g., passageway, channel, etc.) by the channel wall  2400 . The fourth passage  2414  extends around the distribution cap  300  and between the channel wall  2400  and the mixing assembly wall  230 . 
     The decomposition chamber  108  also includes a first corner wall  2416  and a second corner wall  2418 . The first corner wall  2416  is located proximate a first corner of the mixing assembly wall  230  and the second corner wall  2418  is located proximate a second corner of the mixing assembly wall  230 . The first corner wall  2416  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first corner wall  2416  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  242  (e.g., such that flow of the exhaust gas between the first corner wall  2416  and the outer housing wall  242  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the first corner wall  2416  and the mixing assembly wall  230  is substantially prohibited, etc.). The first corner wall  2416  is coupled to the mixing assembly wall  230  at a first end of the first corner wall  2416  and at a second end of the first corner wall  2416 , but is separated from the mixing assembly wall  230  between the first end of the first corner wall  2416  and the second end of the first corner wall  2416 . The second corner wall  2418  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second corner wall  2418  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  242  (e.g., such that flow of the exhaust gas between the second corner wall  2418  and the outer housing wall  242  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the second corner wall  2418  and the mixing assembly wall  230  is substantially prohibited, etc.). The second corner wall  2418  is coupled to the mixing assembly wall  230  at a first end of the second corner wall  2418  and at a second end of the second corner wall  2418 , but is separated from the mixing assembly wall  230  between the first end of the second corner wall  2418  and the second end of the second corner wall  2418 . 
     The first corner wall  2416  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a first gap distance. In some embodiments, the first gap distance is constant along the first corner wall  2416 . In various embodiments, the first gap distance is less than 10 mm. The first gap distance provides thermal insulation, thereby mitigating heat transfer from the first corner wall  2416  and maintaining the first corner wall  2416  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The second corner wall  2418  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a second gap distance. In some embodiments, the second gap distance is constant along the second corner wall  2418 . In various embodiments, the second gap distance is less than 10 mm. In some embodiments, the second gap distance is approximately equal to the first gap distance. In some embodiments, the second corner wall  2418  is an identical reflection of the first corner wall  2416 . The second gap distance provides thermal insulation, thereby mitigating heat transfer from the second corner wall  2418  and maintaining the second corner wall  2418  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The fourth passage  2414  extends between the first corner wall  2416  and the channel wall  2400  and between the second corner wall  2418  and the channel wall  2400 . The fourth passage  2414  may provide the exhaust gas into the mixing assembly flow aperture  2404  or may provide the exhaust gas into the first passage  2408 . 
     XII. Example Decomposition Chamber Having a Ninth Example Mixing Assembly 
       FIG.  25    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a channel wall  2500  coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the channel wall  2500  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the channel wall  2500  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the channel wall  2500  and the mixing assembly wall  230  is substantially prohibited, etc.). In some embodiments, the channel wall  2500  is additionally coupled to the distribution cap wall  304  (e.g., such that flow of the exhaust gas between the channel wall  2500  and the distribution cap wall  304  is substantially prohibited, etc.). 
     The decomposition chamber  108  also includes a tube wall  2501 . The tube wall  2501  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the tube wall  2501  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the tube wall  2501  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the tube wall  2501  and the mixing assembly wall  230  is substantially prohibited, etc.). In some embodiments, the tube wall  2501  is additionally coupled to the distribution cap wall  304  (e.g., such that flow of the exhaust gas between the tube wall  2501  and the distribution cap wall  304  is substantially prohibited, etc.). 
     The channel wall  2500  and the tube wall  2501  collectively form a concentration cavity  2502  and a transfer cavity  2504 . The concentration cavity  2502  is defined between the channel wall  2500 , the tube wall  2501 , the mixing collector wall  226 , the outer housing wall  232 , the mixing assembly wall  230 , and the distribution cap wall  304 . The transfer cavity  2504  is defined between the channel wall  2500 , the tube wall  2501 , the mixing collector wall  226 , the outer housing wall  232 , and the mixing assembly wall  230 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the concentration cavity  2502 . The channel wall  2500  directs the exhaust gas towards a tube wall aperture  2506  (e.g., hole, opening, etc.) in the tube wall  2501 . The injector coupler  254  is coupled to the outer housing wall  232  such that the injection region  314  is located immediately upstream of the tube wall aperture  2506 . 
     The decomposition chamber  108  includes a tube  2508  coupled to the tube wall  2501  around the tube wall aperture  2506  (e.g., such that flow of the exhaust gas between the tube  2508  and the tube wall  2501  is substantially prohibited, etc.). The tube  2508  is positioned between the mixing collector wall  226  and the outer housing wall  232  and is configured to receive the exhaust gas from the concentration cavity  2502  and provide the exhaust gas to the transfer cavity  2504 . As the exhaust gas flows within the tube  2508 , the exhaust gas is caused to swirl, thereby facilitating mixing of the reductant and the exhaust gas. 
     The exhaust gas flows out of the tube  2508  and into the transfer cavity  2504  and exits the transfer cavity via a mixing assembly flow aperture  2510  (e.g., hole, opening, etc.). The mixing assembly flow aperture  2510  provides the exhaust gas through the mixing collector wall  226  and to the SCR catalyst member  216 . 
     XIII. Example Decomposition Chamber Having a Tenth Example Mixing Assembly 
       FIG.  26    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a first flow guide  2600  and a second flow guide  2602 . As is explained in more detail herein, the first flow guide  2600  and the second flow guide  2602  divide the exhaust gas into a first concentration cavity  2604  and a second concentration cavity  2606 . 
     The first flow guide  2600  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first flow guide  2600  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first flow guide  2600  and the mixing collector wall  226  is substantially prohibited, etc.). Similarly, the second flow guide  2602  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second flow guide  2602  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second flow guide  2602  and the mixing collector wall  226  is substantially prohibited, etc.). 
     After the exhaust gas flows out of the distribution cap aperture  302 , the exhaust gas flows into either the first concentration cavity  2604  defined between the first flow guide  2600 , the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232  or the second concentration cavity  2606  defined between the second flow guide  2602 , the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , and the outer housing wall  232 . The first flow guide  2600  and the second flow guide  2602  are each curved (e.g., rounded, convex, etc.) towards the distribution cap  300  such that the exhaust gas is caused to split (e.g., be divided, etc.). 
     As the exhaust gas flows within the first concentration cavity  2604 , the exhaust gas flows along the first flow guide  2600  (e.g., between the first flow guide  2600  and the mixing assembly wall  230 , etc.) and towards a first mixing assembly flow aperture  2608  (e.g., hole, opening, etc.) in the mixing collector wall  226 . Similarly, as the exhaust gas flows within the second concentration cavity  2606 , the exhaust gas flows along the second flow guide  2602  (e.g., between the second flow guide  2602  and the mixing assembly wall  230 , etc.) and towards a second mixing assembly flow aperture  2610  (e.g., hole, opening, etc.) in the mixing collector wall  226 . 
     The exhaust gas flows into either a first swirl cavity  2612  defined between the first flow guide  2600 , the mixing collector wall  226 , and the outer housing wall  232  or a second swirl cavity  2614  defined between the second flow guide  2602 , the mixing collector wall  226 , and the outer housing wall  232 . 
     As the exhaust gas flows within the first swirl cavity  2612 , the exhaust gas flows along the first flow guide  2600  towards the first mixing assembly flow aperture  2608 . Similarly, as the exhaust gas flows within the second swirl cavity  2614 , the exhaust gas flows along the second flow guide  2602  the second mixing assembly flow aperture  334 . 
     In some embodiments, the first flow guide  2600  is spaced apart from, and not coupled to, the second flow guide  2602 . As a result, the exhaust gas may flow from the distribution cap aperture  302  between the first flow guide  2600  and the second flow guide  2602  and into the injection region  314  without flowing through the first swirl cavity  2612  or the second swirl cavity  2614 . This exhaust gas disrupts the spray of reductant, increases convective heat transfer to the sprayed reductant, and increases decomposition of the reductant (which correspondingly decreases a likelihood of impingement of the reductant, and increases uniformity index). 
     In some embodiments, as shown in  FIG.  26   , the decomposition chamber  108  further includes a first perforated cylinder  2616  and a second perforated cylinder  2618 . The first perforated cylinder  2616  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first perforated cylinder  2616  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  around the first mixing assembly flow aperture  2608  (e.g., such that flow of the exhaust gas between the first perforated cylinder  2616  and the mixing collector wall  226  is substantially prohibited, etc.). Similarly, the second perforated cylinder  2618  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second perforated cylinder  2618  and the outer housing wall  232  is substantially prohibited, etc.) and the mixing collector wall  226  around the second mixing assembly flow aperture  2610  (e.g., such that flow of the exhaust gas between the second perforated cylinder  2618  and the mixing collector wall  226  is substantially prohibited, etc.). 
     The first perforated cylinder  2616  includes a plurality of first perforated cylinder perforations  2620  (e.g., holes, openings, apertures, etc.). In operation, the exhaust gas flows from the first swirl cavity  2612  through the first perforated cylinder perforations  2620  into the first perforated cylinder  2616 , and through the first mixing assembly flow aperture  2608 . As the exhaust gas flows through the first perforated cylinder perforations  2620 , a flow of the exhaust gas is straightened (e.g., turbulence of the exhaust gas is reduced, etc.). As a result, the backpressure of the decomposition chamber  108  may be decreased. 
     Similarly, the second perforated cylinder  2618  includes a plurality of second perforated cylinder perforations  2622  (e.g., holes, openings, apertures, etc.). In operation, the exhaust gas flows from the second swirl cavity  2614  through the second perforated cylinder perforations  2622  into the second perforated cylinder  2618 , and through the second mixing assembly flow aperture  2610 . As the exhaust gas flows through the second perforated cylinder perforations  2622 , a flow of the exhaust gas is straightened (e.g., turbulence of the exhaust gas is reduced, etc.). As a result, the backpressure of the decomposition chamber  108  may be decreased. 
     The mixing assembly wall  230  includes an injector coupling recess  2624  that is configured to receive the injector coupler  234 . The injector coupler  234  is coupled to the injector coupling recess  2624 . The injection region  314  is disposed at a junction between the first concentration cavity  2604 , the second concentration cavity  2606 , the first swirl cavity  2612 , and the second swirl cavity  2614 . Due to the relatively high velocity of the exhaust gas within the first concentration cavity  2604 , the second concentration cavity  2606 , the first swirl cavity  2612 , and the second swirl cavity  2614 , impingement of the reductant on the first flow guide  2600  and the second flow guide  2602  is minimized. 
     The injector coupling recess  2624  is configured to receive the injector coupler  234  such that the injector coupler  234  may be coupled to the mixing assembly wall  230  without protruding substantially from the mixing assembly wall  230 . In this way, the space claim of the decomposition chamber  108  may be decreased. 
     The decomposition chamber  108  also includes a first corner wall  2626  and a second corner wall  2628 . The first corner wall  2626  is located proximate a first corner of the mixing assembly wall  230  and the second corner wall  2628  is located proximate a second corner of the mixing assembly wall  230 . The first corner wall  2626  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first corner wall  2626  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  242  (e.g., such that flow of the exhaust gas between the first corner wall  2626  and the outer housing wall  242  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the first corner wall  2626  and the mixing assembly wall  230  is substantially prohibited, etc.). The first corner wall  2626  is coupled to the mixing assembly wall  230  at a first end of the first corner wall  2626  and at a second end of the first corner wall  2626 , but is separated from the mixing assembly wall  230  between the first end of the first corner wall  2626  and the second end of the first corner wall  2626 . The second corner wall  2628  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second corner wall  2628  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  242  (e.g., such that flow of the exhaust gas between the second corner wall  2628  and the outer housing wall  242  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the second corner wall  2628  and the mixing assembly wall  230  is substantially prohibited, etc.). The second corner wall  2628  is coupled to the mixing assembly wall  230  at a first end of the second corner wall  2628  and at a second end of the second corner wall  2628 , but is separated from the mixing assembly wall  230  between the first end of the second corner wall  2628  and the second end of the second corner wall  2628 . 
     The first corner wall  2626  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a first gap distance. In some embodiments, the first gap distance is constant along the first corner wall  2626 . In various embodiments, the first gap distance is less than 10 mm. The first gap distance provides thermal insulation, thereby mitigating heat transfer from the first corner wall  2626  and maintaining the first corner wall  2626  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The second corner wall  2628  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a second gap distance. In some embodiments, the second gap distance is constant along the second corner wall  2628 . In various embodiments, the second gap distance is less than 10 mm. In some embodiments, the second gap distance is approximately equal to the first gap distance. In some embodiments, the second corner wall  2628  is an identical reflection of the first corner wall  2626 . The second gap distance provides thermal insulation, thereby mitigating heat transfer from the second corner wall  2628  and maintaining the second corner wall  2628  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     XIV. Example Decomposition Chamber Having an Eleventh Example Mixing Assembly 
       FIG.  27    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a plenum  2700 . The plenum  2700  includes an plenum outer wall  2702  that is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the plenum outer wall  2702  and the outer housing wall  232  is substantially prohibited, etc.). 
     The plenum  2700  also includes an plenum inner wall  2704 . The plenum inner wall  2704  is coupled to the plenum outer wall  2702 . In some embodiments, the plenum inner wall  2704  is structurally integrated with the plenum outer wall  2702 . The plenum  2700  also includes a plenum inlet  2706  and a plenum outlet  2708 . The plenum inlet  2706  is configured to receive exhaust gas from outside of the plenum  2700  and provide the exhaust gas into the plenum inner wall  2704 . The plenum outlet  2708  is configured to provide the exhaust gas from the plenum inner wall  2704  out of the plenum  2700  and through the mixing collector wall  226  (e.g., such that the exhaust gas can flow to the SCR catalyst member  216 . 
     The mixing assembly wall  230  includes an injector coupling recess  2710  that is configured to receive the injector coupler  234 . The injector coupler  234  is coupled to the injector coupling recess  2710 . The injection region  314  is disposed proximate the plenum inlet  2706  and within the plenum inner wall  2704 . 
     After the exhaust gas flows out of the distribution cap aperture  302 , the exhaust gas flows between the plenum outer wall  2702  and the mixing collector wall  226 . The exhaust gas then enters the plenum  2700  via the plenum inlet  2706 . The exhaust gas mixes with the reductant within the plenum inner wall  2704  and flows through a throat portion  2712  defined by the plenum inner wall  2704 . As the exhaust gas flows through the throat portion  2712 , a velocity of the exhaust gas increases. The exhaust gas flows from the throat portion  2712  into a cup  2714  defined by the plenum inner wall  2704 . The cup  2714  causes the exhaust gas to swirl around the plenum outlet  2708 . 
     In some embodiments, as shown in  FIG.  27   , the decomposition chamber  108  further includes a perforated cylinder  2716 . The perforated cylinder  2716  is coupled to the outer housing wall  232  (e.g., such that flow of the exhaust gas between the perforated cylinder  2716  and the outer housing wall  232  is substantially prohibited, etc.) and the plenum inner wall  2704  around the plenum outlet  2708  (e.g., such that flow of the exhaust gas between the perforated cylinder  2716  and the plenum inner wall  2704  is substantially prohibited, etc.). 
     The perforated cylinder  2716  includes a plurality of perforated cylinder perforations  2718  (e.g., holes, openings, apertures, etc.). In operation, the exhaust gas flows from the cup  2714  through the perforated cylinder perforations  2718  into the perforated cylinder  2716 , and through the plenum outlet  2708 . As the exhaust gas flows through the perforated cylinder perforations  2718 , a flow of the exhaust gas is straightened (e.g., turbulence of the exhaust gas is reduced, etc.). As a result, the backpressure of the decomposition chamber  108  may be decreased. 
     XV. Example Decomposition Chamber Having a Twelfth Example Mixing Assembly 
       FIGS.  28 - 33    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  2800 . 
     The dividing tube  2800  includes a dividing tube body  2802  (e.g., frame, shell, etc.). The dividing tube body  2802  is generally cylindrical, oval, oblong, or stadium-shaped (e.g., discorectangular, obround, etc.). In  FIG.  31 A , the dividing tube body  2802  is generally cylindrical. In  FIG.  31 B , the dividing tube body  2802  is stadium-shaped. For example, the dividing tube body  2802  may have a major axis that is approximately equal to 1.25 times a minor axis of the dividing tube body  2802 . By making the dividing tube body  2802  stadium-shaped, an effective flow area of the dividing tube body  2802  (e.g., through which the exhaust gas may flow, etc.) may be increased, thereby increasing an ability of the decomposition chamber  108  to treat exhaust gas. 
     In various embodiments, the dividing tube body  2802  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  2802  and the mixing assembly wall  230  is substantially prohibited, etc.) and/or the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  2802  and the mixing collector wall  226  is substantially prohibited, etc.). In various embodiments, the dividing tube body  2802  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  2802  and the outer housing wall  232  is facilitated, etc.). 
     The dividing tube body  2802  is positioned within a dividing tube coupler aperture  2803  (e.g., hole, opening, etc.) in the mixing collector wall  226  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  2802 , etc.). The dividing tube body  2802  is coupled to the mixing collector wall  226  around the dividing tube coupler aperture  2803 . 
     The dividing tube  2800  also includes a first dividing tube flange  2804  (e.g., wall, divider, etc.). The first dividing tube flange  2804  is coupled (e.g., a first portion of the first dividing tube flange  2804  is coupled to, etc.) to a first end  2806  of the dividing tube body  2802  (e.g., such that flow of the exhaust gas between the first end  2806  and the first dividing tube flange  2804  is substantially prohibited, etc.). The first dividing tube flange  2804  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  2804  is substantially prohibited, etc.). 
     In various embodiments, the first dividing tube flange  2804  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  2803  (e.g., along a side of the dividing tube coupler aperture  2803 , etc.). In various embodiments, the first dividing tube flange  2804  is not positioned within the dividing tube coupler aperture  2803 . 
     The dividing tube  2800  also includes a dividing tube panel  2810  (e.g., wall, divider, etc.). The dividing tube panel  2810  is coupled to the dividing tube body  2802  (e.g., such that flow of the exhaust gas between the dividing tube body  2802  and the dividing tube panel  2810  is substantially prohibited, etc.). The dividing tube panel  2810  is also coupled to the first dividing tube flange  2804  (e.g., such that flow of the exhaust gas between the first dividing tube flange  2804  and the dividing tube panel  2810  is substantially prohibited, etc.). 
     The dividing tube  2800  also includes a dividing tube endplate  2812  (e.g., panel, wall, divider, etc.). The dividing tube endplate  2812  is coupled to the dividing tube panel  2810  (e.g., such that flow of the exhaust gas between the dividing tube panel  2810  and the dividing tube endplate  2812  is substantially prohibited, etc.). The dividing tube endplate  2812  is also coupled to the first dividing tube flange  2804  (e.g., such that flow of the exhaust gas between the first dividing tube flange  2804  and the dividing tube endplate  2812  is substantially prohibited, etc.). The dividing tube endplate  2812  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube endplate  2812  is substantially prohibited, etc.). 
     In various embodiments, the dividing tube endplate  2812  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  2803  (e.g., along a side of the dividing tube coupler aperture  2803 , etc.). In various embodiments, the dividing tube endplate  2812  is not positioned within the dividing tube coupler aperture  2803 . 
     The dividing tube  2800  also includes a second dividing tube flange  2814  (e.g., wall, divider, etc.). The second dividing tube flange  2814  is coupled (e.g., a first portion of the second dividing tube flange  2814  is coupled to, etc.) to a second end  2816  of the dividing tube body  2802  (e.g., such that flow of the exhaust gas between the second end  2816  and the second dividing tube flange  2814  is substantially prohibited, etc.). The second end  2816  is opposite the first end  2806 . The second dividing tube flange  2814  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  2814  is substantially prohibited, etc.). 
     The first end  2806  may include tabs that are configured to be received within slots within the first dividing tube flange  2804  to facilitate coupling of the dividing tube body  2802  to the first dividing tube flange  2804 . The second end  2816  may include tabs that are configured to be received within slots within the second dividing tube flange  2814  to facilitate coupling of the dividing tube body  2802  to the second dividing tube flange  2814 . 
     In various embodiments, the second dividing tube flange  2814  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  2803  (e.g., along a side of the dividing tube coupler aperture  2803 , etc.). In various embodiments, the second dividing tube flange  2814  is not positioned within the dividing tube coupler aperture  2803 . 
     The dividing tube  2800  also includes a dividing tube collector  2818  (e.g., scoop, panel, etc.). The dividing tube collector  2818  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube collector  2818  is substantially prohibited, etc.) such that a portion of the dividing tube body  2802  is positioned within and/or adjacent to the dividing tube collector  2818 . 
     In various embodiments, the dividing tube collector  2818  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  2803  (e.g., along a side of the dividing tube coupler aperture  2803 , etc.). In various embodiments, the dividing tube collector  2818  is not positioned within the dividing tube coupler aperture  2803 . 
     The dividing tube  2800  also includes a dividing tube dividing wall  2820  (e.g., flange, divider, etc.). The dividing tube dividing wall  2820  is coupled to the dividing tube body  2802  (e.g., such that flow of the exhaust gas between the dividing tube dividing wall  2820  and the dividing tube body  2802  is substantially prohibited, etc.). The dividing tube dividing wall  2820  is also coupled to the dividing tube collector  2818  (e.g., such that flow of the exhaust gas between the dividing tube dividing wall  2820  and the dividing tube collector  2818  is substantially prohibited, etc.). The dividing tube dividing wall  2820  may be positioned within the dividing tube coupler aperture  2803 . 
     In various embodiments, the dividing tube  2800  also includes a dividing tube guide  2822  (e.g., scoop, vane, etc.). The dividing tube guide  2822  is configured to guide the exhaust gas flowing out of the dividing tube  2800  downstream. The dividing tube guide  2822  includes a dividing tube guide directing wall  2824  (e.g., flange, panel, etc.). The dividing tube guide directing wall  2824  is coupled to the dividing tube dividing wall  2820  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  2824  and the dividing tube dividing wall  2820  is substantially prohibited, etc.). In various embodiments, the dividing tube guide directing wall  2824  is additionally coupled to the dividing tube body  2802  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  2824  and the dividing tube body  2802  is substantially prohibited, etc.). The dividing tube guide directing wall  2824  may be positioned within the dividing tube coupler aperture  2803 . In some embodiments, the dividing tube guide  2822  includes a plurality of dividing tube guide directing walls  2824 , such that the exhaust gas may flow between adjacent dividing tube guide directing walls  2824 . By including multiple dividing tube guide directing walls  2824 , the dividing tube  2800  may provide an increased control over a flow of the exhaust gas. 
     In various embodiments, the dividing tube guide  2822  also includes a dividing tube guide dividing wall  2826  (e.g., flange, panel, etc.). The dividing tube guide dividing wall  2826  is coupled to the dividing tube guide directing wall  2824  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  2824  and the dividing tube guide dividing wall  2826  is substantially prohibited, etc.), the dividing tube dividing wall  2820  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  2824  and the dividing tube guide dividing wall  2826  is substantially prohibited, etc.). The dividing tube guide dividing wall  2826  may be positioned within the dividing tube coupler aperture  2803 . In some embodiments, the dividing tube guide  2822  does not include the dividing tube guide dividing wall  2826 . In some embodiments, the dividing tube  2800  does not include the dividing tube guide  2822 . 
     The dividing tube  2800  establishes a concentration cavity  2828 . The concentration cavity  2828  is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  2802 , the first dividing tube flange  2804 , the dividing tube panel  2810 , the dividing tube endplate  2812 , and the second dividing tube flange  2814 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas concentration cavity enters the dividing tube body  2802  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  2802  via a dividing tube inlet aperture  2830  (e.g., hole, opening, etc.) formed in the dividing tube body  2802 . The dividing tube inlet aperture  2830  is located between the outer housing wall  232  and a location at which the dividing tube panel  2810  couples to the dividing tube body  2802 . After flowing through the dividing tube inlet aperture  2830 , the exhaust gas enters a dividing tube cavity  2832  defined by the dividing tube body  2802 . 
     Second, the exhaust gas may enter the dividing tube body  2802  via a dividing tube body perforation  2834  (e.g., hole, aperture, opening, etc.) formed in the dividing tube body  2802 . The dividing tube body  2802  includes a plurality of the dividing tube body perforations  2834 . According to various embodiments, each of the dividing tube body perforations  2834  is positioned between the dividing tube inlet aperture  2830  and the first dividing tube flange  2804 . After flowing through the dividing tube body perforation  2834 , the exhaust gas enters the dividing tube cavity  2832 . In some embodiments, the dividing tube body  2802  does not include any of the dividing tube body perforations  2834 . 
     Third, the exhaust gas may enter the dividing tube body  2802  via a first dividing tube flange perforation  2836  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  2804  includes a plurality of the first dividing tube flange perforations  2836 . According to various embodiments, each of the first dividing tube flange perforations  2836  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  2806 . After flowing through the first dividing tube flange perforations  2836 , the exhaust gas enters the dividing tube cavity  2832 . 
     Fourth, the exhaust gas may enter the dividing tube body  2802  via a second dividing tube flange aperture  2838  (e.g., hole, opening, etc.). The second dividing tube flange aperture  2838  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  2816 . After flowing through the second dividing tube flange aperture  2838 , the exhaust gas enters the dividing tube cavity  2832 . 
     The dividing tube inlet aperture  2830  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  2832  than the dividing tube body perforations  2834 , the first dividing tube flange perforations  2836 , and the second dividing tube flange aperture  2838  combined. At least a portion of the dividing tube inlet aperture  2830  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the dividing tube inlet aperture  2830  enters the dividing tube cavity  2832  radially (e.g., along a tangent of the dividing tube body  2802 , along a line that is parallel to and offset from a tangent of the dividing tube body  2802 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  2832 . The swirl imparted by the dividing tube inlet aperture  2830  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  2832  and ensures shear on the dividing tube body  2802  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  2802 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  2800  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture  2838  and spaced from the second dividing tube flange  2814 . As a result, the injection region  314  is located within the dividing tube cavity  2832  and the concentration cavity  2828 . As a result, the exhaust gas flowing through the second dividing tube flange aperture  2838  propels reductant provided by the dosing module  112  into the dividing tube cavity  2832 . 
     In various embodiments, the dividing tube body  2802  includes a shield  2840  (e.g., wall, projection, etc.). The shield  2840  is contiguous with the dividing tube inlet aperture  2830  and extends into the dividing tube cavity  2832  (e.g., the shield  2840  is bent inward relative to the dividing tube body  2802 , etc.). The shield  2840  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  2832  via the dividing tube inlet aperture  2830 . 
     The exhaust gas exits the dividing tube cavity  2832  via a dividing tube outlet aperture  2842  and flows towards the SCR catalyst members  216 . The exhaust gas flowing out of the dividing tube outlet aperture  2842  flows between the dividing tube body  2802 , the first dividing tube flange  2804 , the dividing tube panel  2810 , the dividing tube endplate  2812 , and the second dividing tube flange  2814  (e.g., into a recess formed by the dividing tube body  2802 , the first dividing tube flange  2804 , the dividing tube panel  2810 , the dividing tube endplate  2812 , and the second dividing tube flange  2814  in the mixing collector wall  226 ). The dividing tube body  2802 , the first dividing tube flange  2804 , the dividing tube panel  2810 , the dividing tube endplate  2812 , and the second dividing tube flange  2814  create a volume within which the exhaust gas exiting the dividing tube outlet aperture  2842  can expand, thereby minimizing backpressure of the decomposition chamber  108 , facilitating increased UI of the reductant and exhaust gas, and facilitating increased flow distribution index of the exhaust gas. 
     In some embodiments, the dividing tube body  2802 , the first dividing tube flange  2804 , the dividing tube panel  2810 , the dividing tube endplate  2812 , and the second dividing tube flange  2814  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). For example, the dividing tube panel  2810  may include features (e.g., protrusions, projections, ribs, flanges, fins, etc.) that extend towards the SCR catalyst members  216  such that the exhaust gas flowing out of the dividing tube outlet aperture  2842  flows against and/or between the features and is directed towards the SCR catalyst members  216  and/or distributed between the SCR catalyst members  216 . 
     As the exhaust gas flows towards the SCR catalyst members  216 , a portion of the exhaust gas may flow into a dividing tube collector cavity  2844  defined by the dividing tube collector  2818 . A portion of the exhaust gas flowing within the dividing tube collector cavity  2844  is directed by the dividing tube guide  2822  out of the dividing tube collector cavity  2844  towards the SCR catalyst members  216 . Another portion of the exhaust gas flowing within the dividing tube collector cavity  2844  flows out of the dividing tube collector cavity  2844  via dividing tube dividing wall perforations  2846  (e.g., holes, openings, etc.) in the dividing tube dividing wall  2820 . The additional exit for the exhaust gas from the dividing tube collector cavity  2844  provided by the dividing tube dividing wall perforations  2846  minimizes backpressure of the decomposition chamber  108 . 
     In some embodiments, the outer housing wall  232  is spaced apart from the dividing tube body  2802 . As a result, a portion of the exhaust gas flows between the outer housing wall  232  and the dividing tube body  2802 , along the dividing tube body  2802 , between the dividing tube body  2802  and the mixing assembly wall  230 , and into the dividing tube collector cavity  2844 . Therefore, exhaust gas may flow into the dividing tube collector cavity  2844  either from the dividing tube outlet aperture  2842  or after flowing around the dividing tube body  2802 . As a result, the backpressure of the decomposition chamber  108  may be decreased. The exhaust gas flowing around the dividing tube body  2802  functions to heat the dividing tube body  2802 , thereby mitigating impingement of the reductant on the dividing tube body  2802 . Furthermore, the exhaust gas flowing around the dividing tube body  2802  causes the exhaust gas within the dividing tube collector cavity  2844  to be propelled out of the dividing tube collector cavity  2844 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The dividing tube outlet aperture  2842  is positioned proximate the first end  2806 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  2830  to the dividing tube outlet aperture  2842  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  2842  is first swirled by the dividing tube body  2802 . Furthermore, due to the dividing tube inlet aperture  2830  being positioned proximate the second end  2816  and the dividing tube outlet aperture  2842  being positioned proximate the first end  2806 , a distance between the dividing tube inlet aperture  2830  and the dividing tube outlet aperture  2842  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  2832  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The dividing tube body perforations  2834  are disposed on an upstream surface of the dividing tube body  2802  (e.g., adjacent the concentration cavity  2828 , etc.). In some embodiments, at least some of the dividing tube body perforations  2834  are aligned with the dividing tube outlet aperture  2842 . In operation, the dividing tube body perforations  2834  facilitate passage of the exhaust gas through the dividing tube body  2802  and into the dividing tube cavity  2832  without passing through the dividing tube inlet aperture  2830 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube body perforations  2834  functions to heat the dividing tube body  2802 , thereby mitigating impingement of the reductant on the dividing tube body  2802 . By aligning at least some of the dividing tube body perforations  2834  with the dividing tube outlet aperture  2842 , the exhaust gas flowing within the dividing tube cavity  2832  may be propelled out of the dividing tube outlet aperture  2842 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The first dividing tube flange perforations  2836  are disposed on a portion of the first dividing tube flange  2804  that is opposite the dividing tube cavity  2832  (e.g., are located opposite the first end  2806 , etc.). In operation, the first dividing tube flange perforation  2836  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  2804 , etc.) through the first dividing tube flange  2804  and into the dividing tube cavity  2832  without passing through the dividing tube inlet aperture  2830  or the dividing tube body perforations  2834 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first dividing tube flange perforation  2836  functions to heat the first end  2806 , thereby mitigating impingement of the reductant on the first end  2806 . The exhaust gas flowing through the first dividing tube flange perforation  2836  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  2832  towards the dividing tube outlet aperture  2842 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     XVI. Example Decomposition Chamber Having a Thirteenth Example Mixing Assembly 
       FIGS.  34 - 38    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300 , the first channel wall  700 , the second channel wall  702 , the mixing assembly flow aperture  708 , the first flow guide  710 , the second flow guide  712 , the perforations  714 , the baffle  716 , the third flow guide  718 , and the injector coupling recess  2710  as described herein. 
     The decomposition chamber  108  also includes a fourth flow guide  3500  (e.g., vane, wall, partition, divider, etc.). The fourth flow guide  3500  is coupled to the injector coupling recess  2710  and extends towards the distribution cap wall  304  (e.g., proximate the baffle  716 , etc.). The fourth flow guide  3500  is located between the third flow guide  718  and the outer housing wall  232 . The fourth flow guide  3500  functions to break up turbulence between the mixing collector wall  226  and the third flow guide  718  and guides the exhaust gas and reductant between the second channel wall  702  and the distribution cap wall  304  towards the first channel wall  700 . Additionally, the fourth flow guide  3500  may function to mitigate impingement of the reductant on the mixing collector wall  226 . While reductant may contact the fourth flow guide  3500 , exhaust gas flows above and below the fourth flow guide  3500 . This exhaust gas heats the fourth flow guide  3500 , potentially causing the reductant contacting the fourth flow guide  3500  to vaporize, and also biases the reductant off of the fourth flow guide  3500 . In various embodiments, the fourth flow guide  3500  is disposed on a plane that is substantially parallel to a plane upon which the mixing collector wall  226  is disposed and/or a plane upon which the third flow guide  718  is disposed. The fourth flow guide  3500  may at least partially bisect the injection region  314 . In some embodiments, the decomposition chamber  108  does not include the fourth flow guide  3500 . In various embodiments, the fourth flow guide  3500  is not coupled to the second channel wall  702  or the distribution cap wall  304 . 
     The injector coupling recess  2710  includes an inner coupling flange  3402  and an interfacing coupling flange  3404 . The injector coupler  234  is coupled to the interfacing coupling flange  3404 . The inner coupling flange  3402  is spaced apart from the interfacing coupling flange  3404  by a coupling wall  3406 . The fourth flow guide  3500  is coupled to the inner coupling flange  3402 . 
     The decomposition chamber  108  also includes a baffle flange assembly  3502 . The baffle flange assembly  3502  is positioned between the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , the outer housing wall  232 , and the first channel wall  700 . 
     The baffle flange assembly  3502  includes a first baffle flange wall  3504 . The first baffle flange wall  3504  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first baffle flange wall  3504  and the mixing collector wall  226  is substantially prohibited, etc.) and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first baffle flange wall  3504  and the outer housing wall  232  is substantially prohibited, etc.). The first baffle flange wall  3504  is spaced apart from the distribution cap wall  304  such that exhaust gas can flow between the first baffle flange wall  3504  and the distribution cap wall  304  along the first baffle flange wall  3504 . 
     The baffle flange assembly  3502  also includes a second baffle flange wall  3506 . The second baffle flange wall  3506  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second baffle flange wall  3506  and the mixing collector wall  226  is substantially prohibited, etc.) and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second baffle flange wall  3506  and the outer housing wall  232  is substantially prohibited, etc.). The second baffle flange wall  3506  is spaced apart from the first channel wall  700  (e.g., proximate the perforations  714 , etc.) such that exhaust gas can flow between the second baffle flange wall  3506  and the first channel wall  700  along the second baffle flange wall  3506 . The second baffle flange wall  3506  is structurally integrated with the first baffle flange wall  3504 . 
     The baffle flange assembly  3502  also includes a third baffle flange wall  3508 . The third baffle flange wall  3508  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the third baffle flange wall  3508  and the mixing collector wall  226  is substantially prohibited, etc.) and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the third baffle flange wall  3508  and the outer housing wall  232  is substantially prohibited, etc.). The third baffle flange wall  3508  is spaced apart from the mixing assembly wall  230  such that exhaust gas can flow between the third baffle flange wall  3508  and the mixing assembly wall  230  along the third baffle flange wall  3508 . The third baffle flange wall  3508  is structurally integrated with the first baffle flange wall  3504  and the second baffle flange wall  3506 . 
     The second channel wall  702  includes a second channel wall first portion  3509 . The second channel wall first portion  3509  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second channel wall first portion  3509  and the mixing collector wall  226  is substantially prohibited, etc.), and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second channel wall first portion  3509  and the outer housing wall  232  is substantially prohibited, etc.). The third flow guide  718  is coupled to the second channel wall first portion  3509  in various embodiments. 
     The second channel wall  702  also includes a second channel wall second portion  3510 . The second channel wall second portion  3510  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second channel wall second portion  3510  and the mixing collector wall  226  is substantially prohibited, etc.). Unlike the second channel wall first portion  3509 , the second channel wall second portion  3510  is not coupled to the outer housing wall  232 . As a result, flow of the exhaust gas between the second channel wall second portion  3510  and the outer housing wall  232  is facilitated. In this way, a portion of the exhaust gas may flow through the second channel wall  702  without first flowing around the second channel wall  702  (e.g., between the second channel wall  702  and the first channel wall  700 , etc.). In this way, backpressure of the decomposition chamber  108  may be reduced. The second channel wall second portion  3510  is structurally integrated with the second channel wall first portion  3509 . The third flow guide  718  is coupled to the second channel wall second portion  3510  in various embodiments. The injection region  314  is located between the second channel wall second portion  3510  and the distribution cap wall  304 . 
     The second channel wall  702  includes a second channel wall third portion  3512 . The second channel wall third portion  3512  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second channel wall third portion  3512  and the mixing collector wall  226  is substantially prohibited, etc.) and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second channel wall third portion  3512  and the outer housing wall  232  is substantially prohibited, etc.). The second channel wall third portion  3512  is structurally integrated with the second channel wall second portion  3510 . 
     The second channel wall  702  also includes a second channel wall fourth portion  3514 . The second channel wall fourth portion  3514  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second channel wall fourth portion  3514  and the mixing collector wall  226  is substantially prohibited, etc.). Unlike the second channel wall first portion  3509  and the second channel wall third portion  3512 , the second channel wall fourth portion  3514  is not coupled to the outer housing wall  232 . As a result, flow of the exhaust gas between the second channel wall fourth portion  3514  and the outer housing wall  232  is facilitated. In this way, a portion of the exhaust gas may flow through the second channel wall  702  without first flowing around the second channel wall  702  (e.g., between the second channel wall  702  and the second flow guide  712 , etc.). In this way, backpressure of the decomposition chamber  108  may be reduced. The second channel wall fourth portion  3514  is structurally integrated with the second channel wall third portion  3512 . 
     The decomposition chamber  108  also includes a first corner wall  3516  and a second corner wall  3518 . The first corner wall  3516  is located proximate a first corner of the mixing assembly wall  230  and the second corner wall  3518  is located proximate a second corner of the mixing assembly wall  230 . The first corner wall  3516  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the first corner wall  3516  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the first corner wall  3516  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the first corner wall  3516  and the mixing assembly wall  230  is substantially prohibited, etc.). The first corner wall  3516  is coupled to the mixing assembly wall  230  at a first end of the first corner wall  3516  and at a second end of the first corner wall  3516 , but is separated from the mixing assembly wall  230  between the first end of the first corner wall  3516  and the second end of the first corner wall  3516 . The second corner wall  3518  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the second corner wall  3518  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the second corner wall  3518  and the outer housing wall  232  is substantially prohibited, etc.), and the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the second corner wall  3518  and the mixing assembly wall  230  is substantially prohibited, etc.). The second corner wall  3518  is coupled to the mixing assembly wall  230  at a first end of the second corner wall  3518  and at a second end of the second corner wall  3518 , but is separated from the mixing assembly wall  230  between the first end of the second corner wall  3518  and the second end of the second corner wall  3518 . 
     The first corner wall  3516  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a first gap distance. In some embodiments, the first gap distance is constant along the first corner wall  3516 . In various embodiments, the first gap distance is less than 10 mm. The first gap distance provides thermal insulation, thereby mitigating heat transfer from the first corner wall  3516  and maintaining the first corner wall  3516  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . 
     The second corner wall  3518  is separated from (e.g., spaced apart from, etc.) the mixing assembly wall  230  by a second gap distance. In some embodiments, the second gap distance is constant along the second corner wall  3518 . In various embodiments, the second gap distance is less than 10 mm. In some embodiments, the second gap distance is approximately equal to the first gap distance. In some embodiments, the second corner wall  3518  is an identical reflection of the first corner wall  3516 . The second gap distance provides thermal insulation, thereby mitigating heat transfer from the second corner wall  3518  and maintaining the second corner wall  3518  at a relatively high temperature. This relatively high temperature may mitigate formation of reductant deposits and increase the desirability of the decomposition chamber  108 . The second channel wall first portion  3509  is coupled to the second corner wall  3518  (e.g., such that flow of the exhaust gas between the second channel wall first portion  3509  and the second corner wall  3518  is substantially prohibited, etc.) 
     In various embodiments, the decomposition chamber  108  further includes a conical flange  3700 . The conical flange  3700  includes an annular lip  3702 . The annular lip  3702  is positioned within, and coupled to the mixing assembly flow aperture  708 . The conical flange  3700  is positioned between the mixing collector wall  226  and the transfer assembly housing wall  218  and functions to distribute the exhaust gas from the mixing assembly flow aperture  708  across the SCR catalyst members  216 . 
     XVII. Example Decomposition Chamber Having a Fourteenth Example Mixing Assembly 
       FIG.  39    illustrates the decomposition chamber  108  described in  FIGS.  13 - 17    according to another embodiment. In  FIG.  39   , the dividing tube outlet aperture  1318  is trapezoidal with a larger side positioned proximate the injection region  314  and a smaller size position proximate the dividing tube flange  1303 . In this way, the dividing tube outlet aperture  1318  gradually decreases in width at gradually greater distances from the injection region  314 . By shaping the dividing tube outlet aperture  1318  in this manner, a greater proportion of the exhaust gas can be provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the injection region  314  and a lesser proportion of the exhaust gas can be provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the dividing tube flange  1303 . The exhaust gas provided from the dividing tube flange transfer perforations  1334  can supplement the exhaust gas provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the dividing tube flange  1303  such that the amount of exhaust gas provided to each of the SCR catalyst members  216  is substantially the same. 
     XVIII. Example Decomposition Chamber Having a Fifteenth Example Mixing Assembly 
       FIGS.  40 - 41    illustrate the decomposition chamber  108  described in  FIGS.  13 - 17    according to another embodiment. In  FIGS.  40 - 41   , the dividing tube body  1302  also includes a fourth duct  4000  (e.g., cowl, hood, etc.) and a fifth duct  4002  (e.g., cowl, hood, etc.), and the dividing tube body  1302  does not include the third duct  1328 . The fifth duct  4002  is adjacent the dividing tube flange  1303 . The fourth duct  4000  is separated from the dividing tube flange  1303  by the fifth duct  4002  and from the first duct  1312  by the second duct  1320 . 
     The second duct  1320  is contiguous with, and extends over, a dividing tube outlet aperture first portion  4006 . Similarly, the fourth duct  4000  is contiguous with, and extends over, a dividing tube outlet aperture second portion  4008  and the fifth duct  4002  is contiguous with, and extends over, a dividing tube outlet aperture third portion  4010 . The dividing tube outlet aperture first portion  4006 , the dividing tube outlet aperture second portion  4008 , and the dividing tube outlet aperture third portion  4010  collectively define the dividing tube outlet aperture  1318 . Similar to the second duct  1320 , the fourth duct  4000  and the fifth duct  4002  each extends towards the transfer cavity  1306  so as to function to direct the exhaust gas towards the mixing assembly flow aperture  1308 . In some embodiments, the fourth duct  4000  and/or the fifth duct  4002  extends over the mixing assembly flow aperture  1308 . 
     The dividing tube outlet aperture first portion  4006  is defined by a first outlet aperture area A 1  (e.g., an area of the dividing tube body  1302  which was removed to form the dividing tube outlet aperture first portion  4006 , an opening area of the dividing tube outlet aperture first portion  4006 , an effective area of the dividing tube outlet aperture first portion  4006 , etc.). The dividing tube outlet aperture second portion  4008  is defined by a second outlet aperture area A 2  (e.g., an area of the dividing tube body  1302  which was removed to form the dividing tube outlet aperture second portion  4008 , an opening area of the dividing tube outlet aperture second portion  4008 , an effective area of the dividing tube outlet aperture second portion  4008 , etc.). The dividing tube outlet aperture third portion  4010  is defined by a third outlet aperture area A 3  (e.g., an area of the dividing tube body  1302  which was removed to form the dividing tube outlet aperture third portion  4010 , an opening area of the dividing tube outlet aperture third portion  4010 , an effective area of the dividing tube outlet aperture third portion  4010 , etc.). In various embodiments, the A 1  is greater than the A 2 , and the A 2  is greater than the A 3 . This arrangement causes a greater portion of the exhaust gas to flow through the dividing tube outlet aperture first portion  4006  than the dividing tube outlet aperture second portion  4008 , and a greater portion of the exhaust gas to flow through the dividing tube outlet aperture second portion  4008  than the dividing tube outlet aperture third portion  4010 . Such a division of the exhaust gas flowing from the dividing tube outlet aperture  1318  may be advantageous where the dividing tube outlet aperture first portion  4006  is closest to a larger number of the SCR catalyst members  216  than the numbers of SCR catalyst members  216  that are closest to the dividing tube outlet aperture second portion  4008  and/or the dividing tube outlet aperture third portion  4010 . 
     In various embodiments, the dividing tube outlet aperture first portion  4006 , the dividing tube outlet aperture second portion  4008 , and the dividing tube outlet aperture third portion  4010  are staggered relative to one another along the dividing tube body  1302  (e.g., angularly offset along the circumference of the dividing tube body  1302 , etc.). As a result of this staggering, the dividing tube outlet aperture first portion  4006 , the dividing tube outlet aperture second portion  4008 , and the dividing tube outlet aperture third portion  4010  are each located differently with respect to the mixing collector wall  226 . For example, the dividing tube outlet aperture first portion  4006  may be located such that 80% or more of the dividing tube outlet aperture first portion  4006  is located between the mixing collector wall  226  and the outer housing wall  232  and 20% or less of the dividing tube outlet aperture first portion  4006  is located between the mixing collector wall  226  and the transfer assembly housing wall  218 . The dividing tube outlet aperture second portion  4008  may be located such that 50% or more of the dividing tube outlet aperture second portion  4008  is located between the mixing collector wall  226  and the outer housing wall  232  and 50% or less of the dividing tube outlet aperture second portion  4008  is located between the mixing collector wall  226  and the transfer assembly housing wall  218 . The dividing tube outlet aperture third portion  4010  may be located such that 20% or more of the dividing tube outlet aperture third portion  4010  is located between the mixing collector wall  226  and the outer housing wall  232  and 80% or less of the dividing tube outlet aperture third portion  4010  is located between the mixing collector wall  226  and the transfer assembly housing wall  218 . 
     In various embodiments, the second duct  1320 , the fourth duct  4000 , and the fifth duct  4002  are staggered relative to one another along the dividing tube body  1302  (e.g., angularly offset along the circumference of the dividing tube body  1302 , etc.). As a result of this staggering, the second duct  1320 , the fourth duct  4000 , and the fifth duct  4002  are each located differently with respect to the mixing collector wall  226 . For example, the second duct  1320  may be located such that 90% or more of the second duct  1320  is located between the mixing collector wall  226  and the outer housing wall  232  and 10% or less of the second duct  1320  is located between the mixing collector wall  226  and the transfer assembly housing wall  218 . The fourth duct  4000  may be located such that 80% or more of the fourth duct  4000  is located between the mixing collector wall  226  and the outer housing wall  232  and 20% or less of the fourth duct  4000  is located between the mixing collector wall  226  and the transfer assembly housing wall  218 . The fifth duct  4002  may be located such that 60% or more of the fifth duct  4002  is located between the mixing collector wall  226  and the outer housing wall  232  and 40% or less of the fifth duct  4002  is located between the mixing collector wall  226  and the transfer assembly housing wall  218 . 
     By shaping the dividing tube outlet aperture  1318  in this manner, a greater proportion of the exhaust gas can be provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the injection region  314  and a lesser proportion of the exhaust gas can be provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the dividing tube flange  1303 . The exhaust gas provided from the dividing tube flange transfer perforations  1334  can supplement the exhaust gas provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the dividing tube flange  1303  such that the amount of exhaust gas provided to each of the SCR catalyst members  216  is substantially the same. 
     XIX. Example Decomposition Chamber Having a Sixteenth Example Mixing Assembly 
       FIGS.  42 - 43    illustrate the decomposition chamber  108  described in  FIGS.  13 - 17    according to another embodiment. In  FIGS.  42 - 43   , the dividing tube body  1302  does not include the third duct  1328 . The dividing tube outlet aperture  1318  is trapezoidal with a larger side positioned proximate the injection region  314  and a smaller size position proximate the dividing tube flange  1303 . In this way, the dividing tube outlet aperture  1318  gradually decreases in width at gradually greater distances from the injection region  314 . By shaping the dividing tube outlet aperture  1318  in this manner, a greater proportion of the exhaust gas can be provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the injection region  314  and a lesser proportion of the exhaust gas can be provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the dividing tube flange  1303 . The exhaust gas provided from the dividing tube flange transfer perforations  1334  can supplement the exhaust gas provided from the dividing tube outlet aperture  1318  to the SCR catalyst members  216  proximate the dividing tube flange  1303  such that the amount of exhaust gas provided to each of the SCR catalyst members  216  is substantially the same. 
     XX. Example Decomposition Chamber Having a Seventeenth Example Mixing Assembly 
       FIG.  44    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a manifold  4400  (e.g., plenum, etc.). As is explained in more detail herein, the manifold  4400  is configured to facilitate mixing of the exhaust gas and the reductant and provision of the exhaust gas and the reductant to the SCR catalyst members  216 . 
     The mixing collector  224  also includes a manifold wall  4402  (e.g., panel, body, etc.). The manifold wall  4402  is coupled to the mixing collector wall  226  and the outer housing wall  232 . The mixing collector  224  also includes the first concentration wall  308  and the second concentration wall  310  as described herein. The first concentration wall  308  and the second concentration wall  310  are each coupled to the manifold wall  4402 . As a result, the concentration cavity  306  is defined between the distribution cap wall  304 , the mixing collector wall  226 , the mixing assembly wall  230 , the outer housing wall  232 , the first concentration wall  308 , the second concentration wall  310 , and the manifold wall  4402 . 
     The manifold wall  4402  includes a manifold wall aperture  4404  (e.g., hole, opening, etc.). The manifold wall aperture  4404  facilitates flow of the exhaust gas and the reductant through the manifold wall  4402 . The manifold  4400  includes a manifold body  4406  (e.g., frame, shell, casing, etc.). The manifold body  4406  is disposed within the manifold wall aperture  4404  and is coupled to the manifold wall  4402  around the manifold wall aperture  4404 . In some embodiments, the manifold body  4406  is stadium-shaped. 
     In various embodiments, the manifold wall aperture  4404  is located such that the manifold body  4406  is separated from the mixing collector wall  226 , the outer housing wall  232 , the first concentration wall  308 , and the second concentration wall  310  around an entirety of the manifold body  4406 . As a result, the exhaust gas may either flow into the manifold body  4406  or may flow around the manifold body  4406 . By flowing around the manifold body  4406 , a temperature of the manifold body  4406  may be increased such that formation of deposits on the manifold body  4406  is mitigated. 
     The manifold body  4406  includes a manifold body inlet  4408  (e.g., aperture, hole, opening, etc.). The manifold body inlet  4408  receives the exhaust gas (e.g., from the distribution cap  300 , etc.) and provides the exhaust gas into the manifold body  4406 . The manifold body  4406  includes a manifold body outlet  4410  (e.g., aperture, hole, opening, etc.). The manifold body outlet  4410  receives the exhaust gas (e.g., from within the manifold body  4406 , etc.) and provides the exhaust gas out of the manifold body  4406  and towards the SCR catalyst members  216 . 
     The manifold body  4406  also includes a manifold body upstream portion  4412 . The manifold body upstream portion  4412  is located upstream of the manifold wall  4402  and is separated from the mixing collector wall aperture  227  by the manifold wall  4402 . The manifold body  4406  also includes a manifold body downstream portion  4414 . The manifold body downstream portion  4414  is located downstream of the manifold wall  4402  and is separated from the distribution cap  300  by the manifold wall  4402 . The manifold wall  4402  divides the manifold body  4406  into the manifold body upstream portion  4412  and the manifold body downstream portion  4414 . In various embodiments, the manifold body upstream portion  4412  is larger than the manifold body downstream portion  4414 . For example, a distance between a leading edge of the manifold body upstream portion  4412  and the manifold wall  4402  may be larger than a distance between a trailing edge of the manifold body downstream portion  4414  and the manifold wall  4402 , 
     The manifold body  4406  also includes a manifold body mixing assembly housing aperture  4416  (e.g., hole, opening, etc.). The manifold body mixing assembly housing aperture  4416  is disposed in the manifold body upstream portion  4412  and is in confronting relation with the mixing collector wall  226 . The manifold body mixing assembly housing aperture  4416  facilitates flow of the exhaust gas into the manifold body  4406  independent of the manifold body inlet  4408 . As a result, exhaust gas flowing between the manifold body upstream portion  4412  and the mixing collector wall  226  (e.g., exhaust gas that did not flow into the manifold body inlet  4408 , etc.) may flow into the manifold body  4406  via the manifold body mixing assembly housing aperture  4416 . In this way, the manifold body mixing assembly housing aperture  4416  may decrease a backpressure of the decomposition chamber  108 . 
     The manifold body  4406  also includes a manifold body outer housing aperture  4418  (e.g., hole, opening, etc.). The manifold body outer housing aperture  4418  is disposed in the manifold body upstream portion  4412  and is in confronting relation with the outer housing wall  232 . In various embodiments, a diameter of the manifold body outer housing aperture  4418  is equal to a diameter of the manifold body mixing assembly housing aperture  4416 . 
     Rather than being coupled to the mixing assembly wall  230 , as in other embodiments, the injector coupler  234  is coupled to the outer housing wall  232 . The injector coupler  234  is aligned with the manifold body outer housing aperture  4418  such that reductant from the injector  120  and/or the dosing module  112  is provided into the manifold body  4406  via the manifold body outer housing aperture  4418 . 
     The manifold body mixing assembly housing aperture  4416  may be aligned with the manifold body outer housing aperture  4418 . In this way, reductant provided from the injector  120  and/or the dosing module  112  may be provided towards the manifold body mixing assembly housing aperture  4416 . The exhaust gas entering the manifold body  4406  via the manifold body mixing assembly housing aperture  4416  may mitigate formation of deposits on the manifold body  4406  (e.g., by flowing against the reductant provided by the injector  120  and/or the dosing module  112 , etc.). 
     In some embodiments, the exhaust gas does not flow into the manifold body  4406  via the manifold body outer housing aperture  4418 . Instead, only reductant flows into the manifold body  4406  via the manifold body outer housing aperture  4418 . In these embodiments, the injector  120  and/or the dosing module  112  may be coupled to the manifold body upstream portion  4412  around the manifold body outer housing aperture  4418 . The exhaust gas flowing into the manifold body  4406  via the manifold body mixing assembly housing aperture  4416  may mitigate deposit formation on the manifold body  4406 . 
     In some embodiments, the exhaust gas flows into the manifold body  4406  via the manifold body outer housing aperture  4418  and the reductant flows into the manifold body  4406  via the manifold body outer housing aperture  4418 . In these embodiments, the manifold body outer housing aperture  4418  facilitates flow of the exhaust gas into the manifold body  4406  independent of the manifold body inlet  4408 . As a result, exhaust gas flowing between the manifold body upstream portion  4412  and the outer housing wall  232  (e.g., exhaust gas that did not flow into the manifold body inlet  4408  or the manifold body outer housing aperture  4418 , etc.) may flow into the manifold body  4406  via the manifold body outer housing aperture  4418 . In this way, the manifold body outer housing aperture  4418  may decrease a backpressure of the decomposition chamber  108 . The exhaust gas flowing into the manifold body  4406  via the manifold body outer housing aperture  4418  may assist (e.g., propel, guide, etc.) the reductant in flowing into the manifold body  4406  via the manifold body outer housing aperture  4418 . For example, the decomposition chamber  108  may also include an exhaust assist guide (e.g., cone, etc.) which is coupled to the manifold body upstream portion  4412  around the manifold body outer housing aperture  4418  and which includes apertures (e.g., perforations, openings, louvers, etc.) which facilitate flow of the exhaust gas into the exhaust assist guide for propelling the reductant into the manifold body  4406 . 
     The decomposition chamber  108  also includes a concentrating flange  4420 . The concentrating flange  4420  is coupled to the housing body  236  and/or the mixing collector wall  226 . The concentrating flange extends around at least a portion of the mixing collector wall aperture  227  and is configured to direct the exhaust gas flowing from the manifold body outlet  4410  towards the SCR catalyst members  216 . The concentrating flange  4420  is rounded and/or tapered away from the housing body  236  and towards the SCR catalyst members  216 . In this way, formation of deposits downstream of the manifold body outlet  4410  and upstream of the SCR catalyst members  216  (e.g., on the housing body  236 , etc.) is mitigated. 
     XXI. Example Decomposition Chamber Having an Eighteenth Example Mixing Assembly 
       FIG.  45    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  4500 . The dividing tube  4500  may be similar to, for example, the dividing tube  2800  as previously described. The dividing tube  4500  includes a first end  4502  that receives all of the exhaust gas and a second end  4504  that provides all of the exhaust gas to the SCR catalyst members  216 . 
     XXII. Example Decomposition Chamber Having a Nineteenth Example Mixing Assembly 
       FIGS.  46  and  47    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  4600 . The dividing tube  4600  may be similar to, for example, the dividing tube  2800  as previously described. For example, the dividing tube  4600  may also include the dividing tube dividing wall  2820  and/or the dividing tube guide  2822 . 
     The dividing tube  4600  includes a dividing tube body  4602  (e.g., frame, shell, etc.). The dividing tube body  4602  is generally cylindrical, oval, or oblong. In various embodiments, the dividing tube body  4602  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  4602  and the mixing assembly wall  230  is substantially prohibited, etc.) and/or the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  4602  and the mixing collector wall  226  is substantially prohibited, etc.). In various embodiments, the dividing tube body  4602  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  4602  and the outer housing wall  232  is facilitated, etc.). 
     The decomposition chamber  108  is centered on a decomposition chamber axis  4604  (e.g., center axis, etc.). The exhaust gas flowing within the decomposition chamber  108  may travel within the decomposition chamber  108  along a direction that is approximately parallel to (e.g., within 5% of parallel to, parallel to, etc.) the decomposition chamber axis  4604 . The decomposition chamber axis  4604  extends through the communication assembly housing wall  212 , the housing body  236 , the transfer assembly housing wall  218 , the mixing collector wall  226 , and the outer housing wall  232 . 
     The distribution cap  300  is centered on a distribution cap axis  4606  (e.g., center axis, etc.). The distribution cap axis  4606  extends through the communication assembly housing wall  212 , the housing body  236 , the transfer assembly housing wall  218 , the mixing collector wall  226 , and the outer housing wall  232 . The distribution cap axis  4606  and the decomposition chamber axis  4604  extend along a decomposition chamber plane  4608 . The decomposition chamber plane  4608  bisects the decomposition chamber  108 . 
     The dividing tube body  4602  is centered on a dividing tube body axis  4610  (e.g., center axis, etc.). The exhaust gas flowing within the dividing tube body  4602  may travel within the dividing tube body  4602  along a direction that is approximately parallel to the dividing tube body axis  4610 . In various embodiments, the dividing tube body axis  4610  extends through the mixing assembly wall  230 . In some embodiments, the dividing tube body axis  4610  extends through the housing body  236 . 
     The dividing tube body axis  4610  intersects the decomposition chamber plane  4608 . The dividing tube body axis  4610  and the decomposition chamber plane  4608  extend along a dividing tube plane  4612 . In various embodiments, at least one of the decomposition chamber axis  4604  or the distribution cap axis  4606  is orthogonal to the dividing tube plane  4612 . When measured on the dividing tube plane  4612 , the dividing tube body axis  4610  is separated from the decomposition chamber plane  4608  by an angular separation k. In various embodiments, the angular separation X is not equal to 90 degrees (°). In various embodiments, the angular separation k is equal to between approximately 5° and 30°, inclusive (e.g., 4.5°, 5°, 10°, 15°, 20°, 25°, 30°, 32°, etc.). 
     The dividing tube  4600  is shown in more detail in  FIGS.  48  and  49   . The dividing tube body  4602  may be positioned within a dividing tube coupler aperture  4614  (e.g., hole, opening, etc.) in the mixing collector wall  226  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  4602 , etc.). The dividing tube body  4602  may be coupled to the mixing collector wall  226  around the dividing tube coupler aperture  4614 . 
     The dividing tube  4600  also includes a first dividing tube flange  4616  (e.g., wall, divider, etc.). The first dividing tube flange  4616  is coupled (e.g., a first portion of the first dividing tube flange  4616  is coupled to, etc.) to a first end  4618  of the dividing tube body  4602  (e.g., such that flow of the exhaust gas between the first end  4618  and the first dividing tube flange  4616  is substantially prohibited, etc.). The first dividing tube flange  4616  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  4616  is substantially prohibited, etc.). 
     In various embodiments, the first dividing tube flange  4616  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  4614  (e.g., along a side of the dividing tube coupler aperture  4614 , etc.). In various embodiments, the first dividing tube flange  4616  is not positioned within the dividing tube coupler aperture  4614 . 
     The dividing tube  4600  also includes a second dividing tube flange  4619  (e.g., wall, divider, etc.). The second dividing tube flange  4619  is coupled (e.g., a first portion of the second dividing tube flange  4619  is coupled to, etc.) to a second end  4620  of the dividing tube body  4602  (e.g., such that flow of the exhaust gas between the second end  4620  and the second dividing tube flange  4619  is substantially prohibited, etc.). The second end  4620  is opposite the first end  4618 . The second dividing tube flange  4619  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  4619  is substantially prohibited, etc.). 
     The first end  4618  may include tabs that are configured to be received within slots within the first dividing tube flange  4616  to facilitate coupling of the dividing tube body  4602  to the first dividing tube flange  4616 . The second end  4620  may include tabs that are configured to be received within slots within the second dividing tube flange  4619  to facilitate coupling of the dividing tube body  4602  to the second dividing tube flange  4619 . 
     In various embodiments, the second dividing tube flange  4619  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  4614  (e.g., along a side of the dividing tube coupler aperture  4614 , etc.). In various embodiments, the second dividing tube flange  4619  is not positioned within the dividing tube coupler aperture  4614 . 
     The dividing tube  4600  also includes a dividing tube collector  4621  (e.g., scoop, panel, etc.). The dividing tube collector  4621  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube collector  4621  is substantially prohibited, etc.) such that a portion of the dividing tube body  4602  is positioned within and/or adjacent to the dividing tube collector  4621 . 
     In various embodiments, the dividing tube collector  4621  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  4614  (e.g., along a side of the dividing tube coupler aperture  4614 , etc.). In various embodiments, the dividing tube collector  4621  is not positioned within the dividing tube coupler aperture  4614 . 
     The dividing tube  4600  establishes a concentration cavity  4622 . The concentration cavity  4622  is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  4602 , the first dividing tube flange  4616 , the dividing tube endplate  2812 , and the second dividing tube flange  4619 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  4602  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  4602  via a dividing tube inlet aperture  4623  (e.g., hole, opening, etc.) formed in the dividing tube body  4602 . After flowing through the dividing tube inlet aperture  4623 , the exhaust gas enters a dividing tube cavity  4624  defined by the dividing tube body  4602 . 
     Second, the exhaust gas may enter the dividing tube body  4602  via a dividing tube body perforation  4626  (e.g., hole, aperture, opening, etc.) formed in the dividing tube body  4602 . The dividing tube body  4602  includes a plurality of the dividing tube body perforations  4626 . According to various embodiments, each of the dividing tube body perforations  4626  is positioned between the dividing tube inlet aperture  4623  and the first dividing tube flange  4616 . After flowing through the dividing tube body perforation  4626 , the exhaust gas enters the dividing tube cavity  4624 . 
     Third, the exhaust gas may enter the dividing tube body  4602  via a first dividing tube flange perforation  4628  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  4616  includes a plurality of the first dividing tube flange perforations  4628 . According to various embodiments, each of the first dividing tube flange perforations  4628  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  4618 . After flowing through the first dividing tube flange perforations  4628 , the exhaust gas enters the dividing tube cavity  4624 . 
     Fourth, the exhaust gas may enter the dividing tube body  4602  via a second dividing tube flange aperture (e.g., hole, opening, etc.). The second dividing tube flange aperture is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  4620 . After flowing through the second dividing tube flange aperture, the exhaust gas enters the dividing tube cavity  4624 . 
     The dividing tube inlet aperture  4623  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  4624  than the dividing tube body perforations  4626 , the first dividing tube flange perforations  4628 , and the second dividing tube flange aperture combined. At least a portion of the dividing tube inlet aperture  4623  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the dividing tube inlet aperture  4623  enters the dividing tube cavity  4624  radially (e.g., along a tangent of the dividing tube body  4602 , along a line that is parallel to and offset from a tangent of the dividing tube body  4602 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  4624 . The swirl imparted by the dividing tube inlet aperture  4623  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  4624  and ensures shear on the dividing tube body  4602  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  4602 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  4600  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture and spaced from the second dividing tube flange  4619 . As a result, the injection region  314  is located within the dividing tube cavity  4624  and the concentration cavity  4622 . As a result, the exhaust gas flowing through the second dividing tube flange aperture propels reductant provided by the dosing module  112  into the dividing tube cavity  4624 . 
     In various embodiments, the dividing tube body  4602  includes a shield  4630  (e.g., wall, projection, etc.). The shield  4630  is contiguous with the dividing tube inlet aperture  4623  and extends into the dividing tube cavity  4624  (e.g., the shield  4630  is bent inward relative to the dividing tube body  4602 , etc.). The shield  4630  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  4624  via the dividing tube inlet aperture  4623 . 
     The exhaust gas exits the dividing tube cavity  4624  via a dividing tube outlet aperture  4632  and flows towards the SCR catalyst members  216 . The exhaust gas flowing out of the dividing tube outlet aperture  4632  flows between the dividing tube body  4602 , the first dividing tube flange  4616 , and the second dividing tube flange  4619  (e.g., into a recess formed by the dividing tube body  4602 , the first dividing tube flange  4616 , and the second dividing tube flange  4619  in the mixing collector wall  226 ). The dividing tube body  4602 , the first dividing tube flange  4616 , and the second dividing tube flange  4619  create a volume within which the exhaust gas exiting the dividing tube outlet aperture  4632  can expand, thereby minimizing backpressure of the decomposition chamber  108 , facilitating increased UI of the reductant and exhaust gas, and facilitating increased flow distribution index of the exhaust gas. 
     In some embodiments, the dividing tube body  4602 , the first dividing tube flange  4616 , and the second dividing tube flange  4619  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). 
     The dividing tube collector  4621  includes a first dividing tube collector vane  4634  (e.g., guide, etc.). The first dividing tube collector vane  4634  is disposed proximate the first end  4618 . The first dividing tube collector vane  4634  is configured to direct the exhaust gas from a dividing tube collector cavity  4636  defined by the dividing tube collector  4621 . Specifically, the first dividing tube collector vane  4634  is configured to direct the exhaust gas away from the first end  4618 . 
     The dividing tube collector  4621  also includes a second dividing tube collector vane  4638  (e.g., guide, etc.). The second dividing tube collector vane  4638  is disposed proximate the second end  4620 . The second dividing tube collector vane  4638  is configured to direct the exhaust gas from the dividing tube collector cavity  4636 . Specifically, the second dividing tube collector vane  4638  is configured to direct the exhaust gas away from the second end  4620 . 
     The dividing tube outlet aperture  4632  is positioned proximate the first end  4618 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  4623  to the dividing tube outlet aperture  4632  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  4632  is first swirled by the dividing tube body  4602 . Furthermore, due to the dividing tube inlet aperture  4623  being positioned proximate the second end  4620  and the dividing tube outlet aperture  4632  being positioned proximate the first end  4618 , a distance between the dividing tube inlet aperture  4623  and the dividing tube outlet aperture  4632  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  4624  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The dividing tube body perforations  4626  are disposed on an upstream surface of the dividing tube body  4602  (e.g., adjacent the concentration cavity  4622 , etc.). In some embodiments, at least some of the dividing tube body perforations  4626  are aligned with the dividing tube outlet aperture  4632 . In operation, the dividing tube body perforations  4626  facilitate passage of the exhaust gas through the dividing tube body  4602  and into the dividing tube cavity  4624  without passing through the dividing tube inlet aperture  4623 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube body perforations  4626  functions to heat the dividing tube body  4602 , thereby mitigating impingement of the reductant on the dividing tube body  4602 . By aligning at least some of the dividing tube body perforations  4626  with the dividing tube outlet aperture  4632 , the exhaust gas flowing within the dividing tube cavity  4624  may be propelled out of the dividing tube outlet aperture  4632 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The first dividing tube flange perforations  4628  are disposed on a portion of the first dividing tube flange  4616  that is opposite the dividing tube cavity  4624  (e.g., are located opposite the first end  4618 , etc.). In operation, the first dividing tube flange perforation  4628  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  4616 , etc.) through the first dividing tube flange  4616  and into the dividing tube cavity  4624  without passing through the dividing tube inlet aperture  4623  or the dividing tube body perforations  4626 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first dividing tube flange perforation  4628  functions to heat the first end  4618 , thereby mitigating impingement of the reductant on the first end  4618 . The exhaust gas flowing through the first dividing tube flange perforation  4628  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  4624  towards the dividing tube outlet aperture  4632 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     XXIII. Example Decomposition Chamber Having a Twentieth Example Mixing Assembly 
       FIGS.  51  and  52    illustrate a dividing tube  5100  for the decomposition chamber  108  according to various embodiments. The dividing tube  5100  may be implemented in the decomposition chamber  108  in place of any of the dividing tubes previously described, such as the dividing tube  800 , the dividing tube  1300 , the dividing tube  2800 , the dividing tube  4500 , or the dividing tube  4600 . 
     The dividing tube  5100  includes a dividing tube body  5102  (e.g., frame, shell, etc.). The dividing tube body  5102  is generally cylindrical, oval, or oblong. In various embodiments, the dividing tube body  5102  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  5102  and the mixing assembly wall  230  is substantially prohibited, etc.) and/or the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  5102  and the mixing collector wall  226  is substantially prohibited, etc.). In various embodiments, the dividing tube body  5102  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  5102  and the outer housing wall  232  is facilitated, etc.). 
     The dividing tube body  5102  is coupled to the mixing collector wall  226  around a dividing tube coupler aperture  5103  (e.g., hole, opening, etc.) in the mixing collector wall  226 . In some embodiments, the dividing tube body  5102  is positioned within the dividing tube coupler aperture  5103  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  5102 , etc.). In other embodiments, the dividing tube body  5102  is in confronting relation with the dividing tube coupler aperture  5103 . 
     The dividing tube  5100  also includes a first dividing tube flange  5104  (e.g., wall, divider, etc.). The first dividing tube flange  5104  is coupled (e.g., a first portion of the first dividing tube flange  5104  is coupled to, etc.) to a first end  5106  of the dividing tube body  5102  (e.g., such that flow of the exhaust gas between the first end  5106  and the first dividing tube flange  5104  is substantially prohibited, etc.). The first dividing tube flange  5104  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  5104  is substantially prohibited, etc.). 
     In various embodiments, the first dividing tube flange  5104  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5103  (e.g., along a side of the dividing tube coupler aperture  5103 , etc.). In various embodiments, the first dividing tube flange  5104  is not positioned within the dividing tube coupler aperture  5103 . 
     In some embodiments, the dividing tube  5100  also includes a cap (e.g., panel, wall, divider, etc.). The cap is coupled to the first end  5106  (e.g., such that flow of the exhaust gas between the first end  5106  and the cap  5108  is substantially prohibited, etc.). The cap is also coupled to the first dividing tube flange  5104  (e.g., such that flow of the exhaust gas between the first dividing tube flange  5104  and the cap is substantially prohibited, etc.). 
     The dividing tube  5100  also includes a dividing tube panel  5110  (e.g., wall, divider, etc.). The dividing tube panel  5110  is coupled to the dividing tube body  5102  (e.g., such that flow of the exhaust gas between the dividing tube body  5102  and the dividing tube panel  5110  is substantially prohibited, etc.). The dividing tube panel  5110  is also coupled to the first dividing tube flange  5104  (e.g., such that flow of the exhaust gas between the first dividing tube flange  5104  and the dividing tube panel  5110  is substantially prohibited, etc.). 
     The dividing tube  5100  also includes a dividing tube endplate  5112  (e.g., panel, wall, divider, etc.). The dividing tube endplate  5112  is coupled to the dividing tube panel  5110  (e.g., such that flow of the exhaust gas between the dividing tube panel  5110  and the dividing tube endplate  5112  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube panel  5110  and the dividing tube endplate  5112  is rounded. As a result, recirculation zones may be decreased. 
     The dividing tube endplate  5112  is also coupled to the first dividing tube flange  5104  (e.g., such that flow of the exhaust gas between the first dividing tube flange  5104  and the dividing tube endplate  5112  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube endplate  5112  and the first dividing tube flange  5104  is rounded. As a result, recirculation zones may be decreased. 
     The dividing tube endplate  5112  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube endplate  5112  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube endplate  5112  and the mixing collector wall  226  is rounded. As a result, recirculation zones may be decreased. 
     In various embodiments, the dividing tube endplate  5112  is disposed along a first plane and the dividing tube panel  5110  is disposed along a second plane that is separated from the first plane by an angular separation that is not equal to 90°. In various embodiments, the angular separation is equal to between approximately 20° and 70°, inclusive (e.g., 19°, 20°, 21°, 30°, 40°, 45°, 50°, 60°, 67°, 70°, 73°, etc.). In other embodiments, the angular separation is approximately equal to 90°. 
     In various embodiments, the dividing tube endplate  5112  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5103  (e.g., along a side of the dividing tube coupler aperture  5103 , etc.). In various embodiments, the dividing tube endplate  5112  is not positioned within the dividing tube coupler aperture  5103 . 
     The dividing tube  5100  also includes a second dividing tube flange  5114  (e.g., wall, divider, etc.). The second dividing tube flange  5114  is coupled (e.g., a first portion of the second dividing tube flange  5114  is coupled to, etc.) to a second end  5116  of the dividing tube body  5102  (e.g., such that flow of the exhaust gas between the second end  5116  and the second dividing tube flange  5114  is substantially prohibited, etc.). The second end  5116  is opposite the first end  5106 . 
     The second dividing tube flange  5114  is also coupled to the dividing tube panel  5110  (e.g., such that flow of the exhaust gas between the dividing tube panel  5110  and the second dividing tube flange  5114  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube panel  5110  and the second dividing tube flange  5114  is rounded. As a result, recirculation zones may be decreased. 
     The second dividing tube flange  5114  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  5114  is substantially prohibited, etc.). In various embodiments, an edge between the mixing collector wall  226  and the second dividing tube flange  5114  is rounded. As a result, recirculation zones may be decreased. 
     The first end  5106  may include tabs that are configured to be received within slots within the first dividing tube flange  5104  to facilitate coupling of the dividing tube body  5102  to the first dividing tube flange  5104 . The second end  5116  may include tabs that are configured to be received within slots within the second dividing tube flange  5114  to facilitate coupling of the dividing tube body  5102  to the second dividing tube flange  5114 . 
     In various embodiments, the second dividing tube flange  5114  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5103  (e.g., along a side of the dividing tube coupler aperture  5103 , etc.). In various embodiments, the second dividing tube flange  5114  is not positioned within the dividing tube coupler aperture  5103 . 
     The dividing tube  5100  also includes a dividing tube collector  5118  (e.g., scoop, panel, etc.). The dividing tube collector  5118  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube collector  5118  is substantially prohibited, etc.). In some embodiments, the dividing tube collector  5118  is coupled to the mixing collector wall  226  such that a portion of the dividing tube body  5102  is positioned within and/or adjacent to the dividing tube collector  5118 . 
     In various embodiments, the dividing tube collector  5118  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5103  (e.g., along a side of the dividing tube coupler aperture  5103 , etc.). In various embodiments, the dividing tube collector  5118  is not positioned within the dividing tube coupler aperture  5103 . 
     The dividing tube  5100  also includes a dividing tube dividing wall  5120  (e.g., flange, divider, etc.). The dividing tube dividing wall  5120  is coupled to the dividing tube body  5102  (e.g., such that flow of the exhaust gas between the dividing tube dividing wall  5120  and the dividing tube body  5102  is substantially prohibited, etc.). The dividing tube dividing wall  5120  is also coupled to the dividing tube collector  5118  (e.g., such that flow of the exhaust gas between the dividing tube dividing wall  5120  and the dividing tube collector  5118  is substantially prohibited, etc.). The dividing tube dividing wall  5120  may be positioned within the dividing tube coupler aperture  5103 . 
     In various embodiments, the dividing tube  5100  also includes a dividing tube guide  5122  (e.g., scoop, vane, etc.). The dividing tube guide  5122  is configured to guide the exhaust gas flowing out of the dividing tube  5100  downstream. The dividing tube guide  5122  includes a dividing tube guide directing wall  5124  (e.g., flange, panel, etc.). The dividing tube guide directing wall  5124  is coupled to the dividing tube dividing wall  5120  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  5124  and the dividing tube dividing wall  5120  is substantially prohibited, etc.). In various embodiments, the dividing tube guide directing wall  5124  is additionally coupled to the dividing tube body  5102  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  5124  and the dividing tube body  5102  is substantially prohibited, etc.). The dividing tube guide directing wall  5124  may be positioned within the dividing tube coupler aperture  5103 . In some embodiments, the dividing tube guide  5122  includes a plurality of dividing tube guide directing walls  5124 , such that the exhaust gas may flow between adjacent dividing tube guide directing walls  5124 . By including multiple dividing tube guide directing walls  5124 , the dividing tube  5100  may provide an increased control over a flow of the exhaust gas. 
     In various embodiments, the dividing tube guide  5122  also includes a dividing tube guide dividing wall  5126  (e.g., flange, panel, etc.). The dividing tube guide dividing wall  5126  is coupled to the dividing tube guide directing wall  5124  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  5124  and the dividing tube guide dividing wall  5126  is substantially prohibited, etc.). The dividing tube guide dividing wall  5126  may be positioned within the dividing tube coupler aperture  5103 . In some embodiments, the dividing tube guide  5122  does not include the dividing tube guide dividing wall  5126 . In some embodiments, the dividing tube  5100  does not include the dividing tube guide  5122 . 
     The dividing tube  5100  establishes a concentration cavity. The concentration cavity is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  5102 , the first dividing tube flange  5104 , the dividing tube panel  5110 , the dividing tube endplate  5112 , and the second dividing tube flange  5114 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  5102  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  5102  via a dividing tube inlet aperture  5130  (e.g., hole, opening, etc.) formed in the dividing tube body  5102 . The dividing tube inlet aperture  5130  is located between the outer housing wall  232  and a location at which the dividing tube panel  5110  couples to the dividing tube body  5102 . After flowing through the dividing tube inlet aperture  5130 , the exhaust gas enters a dividing tube cavity  5132  defined by the dividing tube body  5102 . 
     Second, the exhaust gas may enter the dividing tube body  5102  via a first dividing tube flange opening  5136  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  5104  includes a plurality of the first dividing tube flange openings  5136 . According to various embodiments, each of the first dividing tube flange openings  5136  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  5106 . After flowing through the first dividing tube flange openings  5136 , the exhaust gas enters the dividing tube cavity  5132 . 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  5102  via a second dividing tube flange aperture  5138  (e.g., hole, opening, etc.). The second dividing tube flange aperture  5138  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  5116 . After flowing through the second dividing tube flange aperture  5138 , the reductant enters the dividing tube cavity  5132 . 
     In some embodiments, the exhaust gas may enter the dividing tube body  5102  via a dividing tube body perforation (e.g., hole, aperture, opening, etc.) formed in the dividing tube body  5102 . The dividing tube body  5102  may include a plurality of the dividing tube body perforations. According to various embodiments, each of the dividing tube body perforations is positioned between the dividing tube inlet aperture  5130  and the first dividing tube flange  5104 . After flowing through the dividing tube body perforation, the exhaust gas enters the dividing tube cavity  5132 . 
     The dividing tube inlet aperture  5130  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  5132  than the first dividing tube flange openings  5136  and the second dividing tube flange aperture  5168  combined. At least a portion of the dividing tube inlet aperture  5130  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the dividing tube inlet aperture  5130  enters the dividing tube cavity  5132  radially (e.g., along a tangent of the dividing tube body  5102 , along a line that is parallel to and offset from a tangent of the dividing tube body  5102 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  5132 . The swirl imparted by the dividing tube inlet aperture  5130  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  5132  and ensures shear on the dividing tube body  5102  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  5102 . 
     The dividing tube  5100  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture  5138  and spaced from the second dividing tube flange  5114 . As a result, the injection region  314  is located within the dividing tube cavity  5132  and the concentration cavity. As a result, the reductant provided by the dosing module  112  and/or the injector  120  flows into the dividing tube cavity  5132 . 
     In various embodiments, the dividing tube body  5102  includes a shield  5140  (e.g., wall, projection, etc.). The shield  5140  is contiguous with the dividing tube inlet aperture  5130  and extends into the dividing tube cavity  5132  (e.g., the shield  5140  is bent inward relative to the dividing tube body  5102 , etc.). The shield  5140  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  5132  via the dividing tube inlet aperture  5130 . 
     The exhaust gas exits the dividing tube cavity  5132  via a dividing tube outlet aperture  5142  and flows towards the SCR catalyst members  216 . The exhaust gas flowing out of the dividing tube outlet aperture  5142  flows between the dividing tube body  5102 , the first dividing tube flange  5104 , the dividing tube panel  5110 , the dividing tube endplate  5112 , and the second dividing tube flange  5114  (e.g., into a recess formed by the dividing tube body  5102 , the first dividing tube flange  5104 , the dividing tube panel  5110 , the dividing tube endplate  5112 , and the second dividing tube flange  5114  in the mixing collector wall  226 ). The dividing tube body  5102 , the first dividing tube flange  5104 , the dividing tube panel  5110 , the dividing tube endplate  5112 , and the second dividing tube flange  5114  create a volume within which the exhaust gas exiting the dividing tube outlet aperture  5142  can expand, thereby minimizing backpressure of the decomposition chamber  108 , facilitating increased UI of the reductant and exhaust gas, and facilitating increased flow distribution index of the exhaust gas. 
     In some embodiments, the dividing tube body  5102 , the first dividing tube flange  5104 , the dividing tube panel  5110 , the dividing tube endplate  5112 , and the second dividing tube flange  5114  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). For example, the dividing tube panel  5110  may include features (e.g., protrusions, projections, ribs, flanges, fins, etc.) that extend towards the SCR catalyst members  216  such that the exhaust gas flowing out of the dividing tube outlet aperture  5142  flows against and/or between the features and is directed towards the SCR catalyst members  216  and/or distributed between the SCR catalyst members  216 . 
     As the exhaust gas flows towards the SCR catalyst members  216 , a portion of the exhaust gas may flow into a dividing tube collector cavity  5144  defined by the dividing tube collector  5118 . A portion of the exhaust gas flowing within the dividing tube collector cavity  5144  is directed by the dividing tube guide  5122  out of the dividing tube collector cavity  5144  towards the SCR catalyst members  216 . Another portion of the exhaust gas flowing within the dividing tube collector cavity  5144  flows out of the dividing tube collector cavity  5144  via dividing tube dividing wall perforations  5146  (e.g., holes, openings, etc.) in the dividing tube dividing wall  5120 . The additional exit for the exhaust gas from the dividing tube collector cavity  5144  provided by the dividing tube dividing wall perforations  5146  minimizes backpressure of the decomposition chamber  108 . 
     In some embodiments, the outer housing wall  232  is spaced apart from the dividing tube body  5102 . As a result, a portion of the exhaust gas flows between the outer housing wall  232  and the dividing tube body  5102 , along the dividing tube body  5102 , between the dividing tube body  5102  and the mixing assembly wall  230 , and into the dividing tube collector cavity  5144 . Therefore, exhaust gas may flow into the dividing tube collector cavity  5144  either from the dividing tube outlet aperture  5142  or after flowing around the dividing tube body  5102 . As a result, the backpressure of the decomposition chamber  108  may be decreased. The exhaust gas flowing around the dividing tube body  5102  functions to heat the dividing tube body  5102 , thereby mitigating impingement of the reductant on the dividing tube body  5102 . Further, the exhaust gas flowing around the dividing tube body  5102  causes the exhaust gas within the dividing tube collector cavity  5144  to be propelled out of the dividing tube collector cavity  5144 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The dividing tube outlet aperture  5142  is positioned proximate the first end  5106 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  5130  to the dividing tube outlet aperture  5142  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  5142  is first swirled by the dividing tube body  5102 . Furthermore, due to the dividing tube inlet aperture  5130  being positioned proximate the second end  5116  and the dividing tube outlet aperture  5142  being positioned proximate the first end  5106 , a distance between the dividing tube inlet aperture  5130  and the dividing tube outlet aperture  5142  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  5132  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     In various embodiments, the dividing tube  5100  also includes a blocking panel  5137 . The blocking panel  5137  is contiguous with the dividing tube outlet aperture  5142  and extends from the dividing tube body  5102  towards the dividing tube guide directing wall  5124 . The blocking panel  5137  may facilitate additional swirling of the exhaust gas prior to the exhaust gas flowing towards the dividing tube guide  5122 . 
     The first dividing tube flange openings  5136  are disposed on a portion of the first dividing tube flange  5104  that is opposite the dividing tube cavity  5132  (e.g., are located opposite the first end  5106 , etc.). In operation, the first dividing tube flange opening  5136  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  5104 , etc.) through the first dividing tube flange  5104  and into the dividing tube cavity  5132  without passing through the dividing tube inlet aperture  5130 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first dividing tube flange opening  5136  functions to heat the first end  5106 , thereby mitigating impingement of the reductant on the first end  5106 . The exhaust gas flowing through the first dividing tube flange opening  5136  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  5132  towards the dividing tube outlet aperture  5142 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the first dividing tube flange  5104  includes a plurality of nozzles  5148  (e.g., concentrators, jets, etc.). Each of the nozzles  5148  extends around one of the first dividing tube flange openings  5136  and projects from the first dividing tube flange  5104  into the dividing tube cavity  5132 . The nozzles  5148  function to increase momentum and/or velocity of the exhaust gas propelled through the first dividing tube flange openings  5136 . In this way, the first dividing tube flange openings  5136  may assist in directing the exhaust gas and the reductant out of the dividing tube cavity  5132  and mitigate formation of deposits on the first dividing tube flange  5104 . 
       FIGS.  53  and  54    illustrate the first dividing tube flange  5104  according to various embodiments. Rather than including the nozzles  5148 , the first dividing tube flange  5104  includes a plurality of exterior louvers  5300  (e.g., flaps, guides, toughs, etc.). Each of the exterior louvers  5300  extends along at least one of the first dividing tube flange openings  5136  and extends away from the dividing tube cavity  5132 . As a result, each of the exterior louvers  5300  functions to direct the exhaust gas into the dividing tube cavity  5132  in a target direction (e.g., along the exterior louver  5300 , etc.). In some embodiments, at least one of the exterior louvers  5300  is parallel to another of the exterior louvers  5300  (e.g., a first exterior louver  5300  is disposed along a first axis and a second exterior louver  5300  is disposed along a second axis that is parallel to the first axis, etc.). 
     In some embodiments, the first dividing tube flange  5104  also includes a plurality of interior louvers  5302  (e.g., flaps, guides, toughs, etc.). Each of the interior louvers  5302  extends along at least one of the first dividing tube flange openings  5136  and extends into the dividing tube cavity  5132 . As a result, each of the interior louvers  5302  functions to direct the exhaust gas into the dividing tube cavity  5132  in a target direction (e.g., along the interior louver  5302 , etc.). In some embodiments, at least one of the interior louvers  5302  is parallel to another of the interior louvers  5302  (e.g., a first interior louver  5302  is disposed along a first axis and a second interior louver  5302  is disposed along a second axis that is parallel to the first axis, etc.). 
     Each of the exterior louvers  5300  may extend along a first edge (e.g., top edge, bottom edge, front edge, rear edge, etc.) of one of the first dividing tube flange openings  5136  and each of the interior louvers  5302  may extend along a second edge (e.g., bottom edge, top edge, rear edge, front edge, etc.) of one of the first dividing tube flange openings  5136  that is opposite to the first edge. For example, the exterior louvers  5300  may each extend along a top edge of one of the first dividing tube flange openings  5136 , and the interior louvers  5302  may each extend along a bottom edge of one of the first dividing tube flange openings  5136 . In this way, pairs of the exterior louver  5300  and the interior louver  5302  may cooperate to direct the exhaust gas through the first dividing tube flange  5104  in a target direction. 
       FIG.  55    illustrates the first dividing tube flange  5104  according to various embodiments. The first dividing tube flange  5104  includes a recess  5500  (e.g., depression, etc.). In some embodiments, at least a portion of the recess  5500  is frustoconical. The recess  5500  extends towards the dividing tube cavity  5132  and each of the first dividing tube flange openings  5136  extends through the recess  5500 . 
     In some embodiments, the recess  5500  includes a recess curved surface  5502  surrounding (e.g., extending around, circumscribing, etc.) a recess hub  5504 . The recess hub  5504  may be flat (e.g., relative to the recess curved surface  5502 , etc.). The first dividing tube flange openings  5136  may be disposed within the recess curved surface  5502 . For example, each of the first dividing tube flange openings  5136  may be separated from an adjacent first dividing tube flange openings  5136  by the same angular separation. In one example, each of the first dividing tube flange openings  5136  is separated from an adjacent first dividing tube flange openings  5136  by 45°. 
     The first dividing tube flange  5104  also includes a plurality of interior louvers  5506  (e.g., flaps, guides, toughs, etc.). Each of the interior louvers  5506  extends along at least one of the first dividing tube flange openings  5136  and extends into the dividing tube cavity  5132 . As a result, each of the interior louvers  5506  functions to direct the exhaust gas into the dividing tube cavity  5132  in a target direction (e.g., along the interior louver  5506 , etc.). The interior louvers  5506  may be disposed within the recess curved surface  5502 . For example, each of the interior louvers  5506  may be separated from an adjacent interior louver  5506  by the same angular separation. In one example, each of the interior louvers  5506  is separated from an adjacent interior louver  5506  by 45°. 
     In some embodiments, the interior louvers  5506  and the first dividing tube flange openings  5136  are configured (e.g., via location on the recess curved surface  5502 , via angular separation, etc.) to cause the exhaust gas flowing through the first dividing tube flange openings  5136  to swirl in a first direction that is opposite (e.g., counter, etc.) to a second direction that the exhaust gas flowing from the dividing tube inlet aperture  5130  is caused to swirl. In this way, mixing of the reductant and the exhaust gas may be enhanced. 
     In some embodiments, such as is shown in  FIGS.  56  and  57   , the dividing tube  5100  also includes a dividing tube panel pocket  5600  (e.g., expansion, etc.). The dividing tube panel pocket  5600  is disposed in the dividing tube panel  5110  and is contiguous with the dividing tube body  5102 . The dividing tube panel pocket  5600  extends away from the mixing collector wall  226 . In these embodiments, the dividing tube body  5102  also includes a dividing tube body cutout  5700  (e.g., opening, window, etc.). The dividing tube body  5102  is coupled to the dividing tube panel  5110  such that the dividing tube panel pocket  5600  is aligned with the dividing tube body cutout  5700 . The dividing tube body cutout  5700  facilitates draining of reductant within the dividing tube body  5102  into the dividing tube panel pocket  5600 , thereby decreasing pooling of the reductant. In this way, the dividing tube panel pocket  5600  and the dividing tube body cutout  5700  mitigate formation of deposits. Additionally, the dividing tube body cutout  5700  provides additional exhaust gas and reductant from the dividing tube body  5102 , thus decreasing a pressure drop of the dividing tube  5100 . 
     XXIV. Example Decomposition Chamber Having a Twenty-First Example Mixing Assembly 
       FIG.  58    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  5800 . 
     The dividing tube  5800  includes a dividing tube body  5802  (e.g., frame, shell, etc.). The dividing tube body  5802  is generally cylindrical, oval, oblong, or stadium-shaped. The dividing tube body  5802  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  5802  and the outer housing wall  232  is facilitated, etc.). 
     The dividing tube body  5802  is positioned within a dividing tube coupler aperture  5803  (e.g., hole, opening, etc.) in the mixing collector wall  226  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  5802 , etc.). The dividing tube body  5802  is coupled to the mixing collector wall  226  around the dividing tube coupler aperture  5803 . 
     The dividing tube  5800  also includes a first dividing tube flange  5804  (e.g., wall, divider, etc.). The first dividing tube flange  5804  is coupled (e.g., a first portion of the first dividing tube flange  5804  is coupled to, etc.) to a first end  5806  of the dividing tube body  5802  (e.g., such that flow of the exhaust gas between the first end  5806  and the first dividing tube flange  5804  is substantially prohibited, etc.). The first dividing tube flange  5804  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  5804  is substantially prohibited, etc.). 
     In various embodiments, the first dividing tube flange  5804  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5803  (e.g., along a side of the dividing tube coupler aperture  5803 , etc.). In various embodiments, the first dividing tube flange  5804  is not positioned within the dividing tube coupler aperture  5803 . 
     The dividing tube  5800  also includes a dividing tube panel  5810  (e.g., wall, divider, etc.). The dividing tube panel  5810  is coupled to the dividing tube body  5802  (e.g., such that flow of the exhaust gas between the dividing tube body  5802  and the dividing tube panel  5810  is substantially prohibited, etc.). The dividing tube panel  5810  is also coupled to the first dividing tube flange  5804  (e.g., such that flow of the exhaust gas between the first dividing tube flange  5804  and the dividing tube panel  5810  is substantially prohibited, etc.). 
     The dividing tube  5800  also includes a dividing tube endplate  5812  (e.g., panel, wall, divider, etc.). The dividing tube endplate  5812  is coupled to the dividing tube panel  5810  (e.g., such that flow of the exhaust gas between the dividing tube panel  5810  and the dividing tube endplate  5812  is substantially prohibited, etc.). The dividing tube endplate  5812  is also coupled to the first dividing tube flange  5804  (e.g., such that flow of the exhaust gas between the first dividing tube flange  5804  and the dividing tube endplate  5812  is substantially prohibited, etc.). The dividing tube endplate  5812  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube endplate  5812  is substantially prohibited, etc.). 
     In various embodiments, the dividing tube endplate  5812  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5803  (e.g., along a side of the dividing tube coupler aperture  5803 , etc.). In various embodiments, the dividing tube endplate  5812  is not positioned within the dividing tube coupler aperture  5803 . 
     The dividing tube  5800  also includes a second dividing tube flange  5814  (e.g., wall, divider, etc.). The second dividing tube flange  5814  is coupled (e.g., a first portion of the second dividing tube flange  5814  is coupled to, etc.) to a second end  5816  of the dividing tube body  5802  (e.g., such that flow of the exhaust gas between the second end  5816  and the second dividing tube flange  5814  is substantially prohibited, etc.). The second end  5816  is opposite the first end  5806 . The second dividing tube flange  5814  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  5814  is substantially prohibited, etc.). 
     The first end  5806  may include tabs that are configured to be received within slots within the first dividing tube flange  5804  to facilitate coupling of the dividing tube body  5802  to the first dividing tube flange  5804 . The second end  5816  may include tabs that are configured to be received within slots within the second dividing tube flange  5814  to facilitate coupling of the dividing tube body  5802  to the second dividing tube flange  5814 . 
     In various embodiments, the second dividing tube flange  5814  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  5803  (e.g., along a side of the dividing tube coupler aperture  5803 , etc.). In various embodiments, the second dividing tube flange  5814  is not positioned within the dividing tube coupler aperture  5803 . 
     The dividing tube  5800  establishes a concentration cavity. The concentration cavity is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  5802 , the first dividing tube flange  5804 , the dividing tube panel  5810 , the dividing tube endplate  5812 , and the second dividing tube flange  5814 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  5802  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  5802  via a dividing tube inlet aperture  5818  (e.g., hole, opening, etc.) formed in the dividing tube body  5802 . The dividing tube inlet aperture  5818  is located between the outer housing wall  232  and a location at which the dividing tube panel  5810  couples to the dividing tube body  5802 . After flowing through the dividing tube inlet aperture  5818 , the exhaust gas enters a dividing tube cavity  5820  defined by the dividing tube body  5802 . 
     Second, the exhaust gas may enter the dividing tube body  5802  via a dividing tube body bypass opening  5822  (e.g., window, etc.). The dividing tube body bypass opening  5822  is disposed proximate the second end  5816  and enables a portion of the exhaust gas to flow into the dividing tube cavity  5820  downstream of the dividing tube inlet aperture  5818 . 
     The dividing tube  5800  also includes a dividing tube bypass ramp  5824  (e.g., rib, flange, etc.). The dividing tube bypass ramp  5824  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the mixing assembly wall  230  and the dividing tube bypass ramp  5824  is substantially prohibited, etc.). Additionally, the dividing tube bypass ramp  5824  is coupled to the dividing tube body  5802  (e.g., such that flow of the exhaust gas between the dividing tube body  5802  and the dividing tube bypass ramp  5824  is substantially prohibited, etc.). The dividing tube bypass ramp  5824  is coupled to the dividing tube body  5802  proximate the dividing tube body bypass opening  5822 . At least a portion of the exhaust gas flowing between the dividing tube body  5802  and the mixing assembly wall  230  may flow against the dividing tube bypass ramp  5824  and be directed by the dividing tube bypass ramp  5824  into the dividing tube body bypass opening  5822 . This exhaust gas may be relatively hot (e.g., compared to exhaust gas that entered the dividing tube body  5802  via the dividing tube inlet aperture  5818 , etc.) and therefore may heat various portions of the dividing tube  5800  which mitigates formation of deposits on the dividing tube  5800 . 
     Third, the exhaust gas may enter the dividing tube body  5802  via a first dividing tube flange perforation  5826  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  5804  includes a plurality of the first dividing tube flange perforations  5826 . According to various embodiments, each of the first dividing tube flange perforations  5826  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  5806 . After flowing through the first dividing tube flange perforations  5826 , the exhaust gas enters the dividing tube cavity  5820 . 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  5802  via a second dividing tube flange aperture  5828  (e.g., hole, opening, etc.). The second dividing tube flange aperture  5828  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  5816 . After flowing through the second dividing tube flange aperture  5828 , the reductant enters the dividing tube cavity  5820 . 
     In various embodiments, the dividing tube inlet aperture  5818  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  5820  than the first dividing tube flange perforations  5826  and the dividing tube body bypass opening  5822  combined. At least a portion of the dividing tube inlet aperture  5818  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the dividing tube inlet aperture  5818  enters the dividing tube cavity  5820  radially (e.g., along a tangent of the dividing tube body  5802 , along a line that is parallel to and offset from a tangent of the dividing tube body  5802 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  5820 . The swirl imparted by the dividing tube inlet aperture  5818  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  5820  and ensures shear on the dividing tube body  5802  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  5802 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  5800  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture  5828  and spaced from the second dividing tube flange  5814 . As a result, the injection region  314  is located within the dividing tube cavity  5820  and the concentration cavity. 
     The exhaust gas exits the dividing tube cavity  5820  via a dividing tube outlet aperture  5830  and flows towards the SCR catalyst members  216 . The exhaust gas flowing out of the dividing tube outlet aperture  5830  flows between the dividing tube body  5802 , the first dividing tube flange  5804 , the dividing tube panel  5810 , the dividing tube endplate  5812 , and the second dividing tube flange  5814  (e.g., into a recess formed by the dividing tube body  5802 , the first dividing tube flange  5804 , the dividing tube panel  5810 , the dividing tube endplate  5812 , and the second dividing tube flange  5814  in the mixing collector wall  226 ). The dividing tube body  5802 , the first dividing tube flange  5804 , the dividing tube panel  5810 , the dividing tube endplate  5812 , and the second dividing tube flange  5814  create a volume within which the exhaust gas exiting the dividing tube outlet aperture  5830  can expand, thereby minimizing backpressure of the decomposition chamber  108 , facilitating increased UI of the reductant and exhaust gas, and facilitating increased flow distribution index of the exhaust gas. 
     In some embodiments, the dividing tube body  5802 , the first dividing tube flange  5804 , the dividing tube panel  5810 , the dividing tube endplate  5812 , and the second dividing tube flange  5814  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). For example, the dividing tube panel  5810  may include features (e.g., protrusions, projections, ribs, flanges, fins, etc.) that extend towards the SCR catalyst members  216  such that the exhaust gas flowing out of the dividing tube outlet aperture  5830  flows against and/or between the features and is directed towards the SCR catalyst members  216  and/or distributed between the SCR catalyst members  216 . 
     The dividing tube outlet aperture  5830  is positioned proximate the first end  5806 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  5818  to the dividing tube outlet aperture  5830  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  5830  is first swirled by the dividing tube body  5802 . Furthermore, due to the dividing tube inlet aperture  5818  being positioned proximate the second end and the dividing tube outlet aperture  5830  being positioned proximate the first end  5806 , a distance between the dividing tube inlet aperture  5818  and the dividing tube outlet aperture  5830  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  5820  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The first dividing tube flange perforations  5826  are disposed on a portion of the first dividing tube flange  5804  that is opposite the dividing tube cavity  5820  (e.g., are located opposite the first end  5806 , etc.). In operation, the first dividing tube flange perforation  5826  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  5804 , etc.) through the first dividing tube flange  5804  and into the dividing tube cavity  5820  without passing through the dividing tube inlet aperture  5818 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first dividing tube flange perforation  5826  functions to heat the first end  5806 , thereby mitigating impingement of the reductant on the first end  5806 . The exhaust gas flowing through the first dividing tube flange perforation  5826  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  5820  towards the dividing tube outlet aperture  5830 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     XXV. Example Decomposition Chamber Having a Twenty-Second Example Mixing Assembly 
       FIGS.  59  and  60    illustrate a dividing tube  5900  for the decomposition chamber  108  according to various embodiments. The dividing tube  5900  may be implemented in the decomposition chamber  108  in place of any of the dividing tubes previously described, such as the dividing tube  800 , the dividing tube  1300 , the dividing tube  2800 , or the dividing tube  4600 , or the dividing tube  5100 . 
     The dividing tube  5900  includes a dividing tube body  5902  (e.g., frame, shell, etc.). The dividing tube body  5902  is tapered and includes several cylindrical portions of different diameters. In various embodiments, the dividing tube body  5902  is configured to be positioned within a dividing tube coupler aperture (e.g., hole, opening, etc.) in the mixing collector wall  226  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  5902 , etc.). 
     The dividing tube  5900  also includes a first dividing tube flange  5904  (e.g., wall, divider, etc.). The first dividing tube flange  5904  is coupled (e.g., a first portion of the first dividing tube flange  5904  is coupled to, etc.) to a first end  5905  of the dividing tube body  5902  (e.g., such that flow of the exhaust gas between the first end  5905  and the first dividing tube flange  5904  is substantially prohibited, etc.). The dividing tube  5900  also includes a second dividing tube flange  5906  (e.g., wall, divider, etc.). The second dividing tube flange  5906  is coupled (e.g., a first portion of the second dividing tube flange  5906  is coupled to, etc.) to a second end  5908  of the dividing tube body  5902  (e.g., such that flow of the exhaust gas between the second end  5908  and the second dividing tube flange  5906  is substantially prohibited, etc.). The second end  5908  is opposite the first end  5905 . 
     The first end  5905  may include tabs that are configured to be received within slots within the first dividing tube flange  5904  to facilitate coupling of the dividing tube body  5902  to the first dividing tube flange  5904 . The second end  5908  may include tabs that are configured to be received within slots within the second dividing tube flange  5906  to facilitate coupling of the dividing tube body  5902  to the second dividing tube flange  5906 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  5902  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  5902  via a dividing tube inlet aperture  5910  (e.g., hole, opening, etc.) formed in the dividing tube body  5902 . The dividing tube inlet aperture  5910  is configured to be located between the outer housing wall  232  and a location at which the dividing tube panel couples to the dividing tube body  5902 . After flowing through the dividing tube inlet aperture  5910 , the exhaust gas enters a dividing tube cavity  5912  defined by the dividing tube body  5902 . 
     The exhaust gas flowing through the dividing tube inlet aperture  5910  enters the dividing tube cavity  5912  radially (e.g., along a tangent of the dividing tube body  5902 , along a line that is parallel to and offset from a tangent of the dividing tube body  5902 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  5912 . The swirl imparted by the dividing tube inlet aperture  5910  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  5912  and ensures shear on the dividing tube body  5902  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  5902 . 
     Second, the exhaust gas may enter the dividing tube body  5902  via a first dividing tube flange perforation  5914  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  5904  includes a plurality of the first dividing tube flange perforations  5914 . According to various embodiments, each of the first dividing tube flange perforations  5914  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  5905 . After flowing through the first dividing tube flange perforations  5914 , the exhaust gas enters the dividing tube cavity  5912 . 
     Third, the exhaust gas may enter the dividing tube body  5902  via a first dividing tube flange transfer perforation  5916  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  5904  includes a plurality of the first dividing tube flange transfer perforation  5916 . The first dividing tube flange transfer perforations  5916  are disposed on a portion of the first dividing tube flange  5904  that is not opposite the dividing tube cavity  5912  (e.g., are located downstream of the dividing tube body  5902 , etc.). Instead, the dividing tube flange transfer perforations  5916  are disposed on a portion of the first dividing tube flange  5904  that is opposite the transfer cavity (e.g., downstream of the dividing tube body  5902 , etc.). In operation, the dividing tube flange transfer perforations  5916  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  5904 , etc.) through the first dividing tube flange  5904  and into the transfer cavity without passing through the dividing tube body  5902 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange transfer perforations  5916  functions to heat the first dividing tube flange  5904 , thereby mitigating impingement of the reductant on the first dividing tube flange  5904 . The exhaust gas flowing through the dividing tube flange transfer perforations  5916  may also be useful in redirecting the exhaust gas flowing within the transfer cavity towards a mixing assembly flow aperture, thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  5902  via a second dividing tube flange aperture  5918  (e.g., hole, opening, etc.). The second dividing tube flange aperture  5918  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  5908 . After flowing through the second dividing tube flange aperture  5918 , the reductant enters the dividing tube cavity  5912 . 
     In various embodiments, the dividing tube inlet aperture  5910  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  5912  than the first dividing tube flange perforations  5914 , and the dividing tube flange transfer perforations  5916  combined. 
     In various embodiments, the dividing tube body  5902  includes a shield  5920  (e.g., wall, projection, etc.). The shield  5920  is contiguous with the dividing tube inlet aperture  5910  and extends into the dividing tube cavity  5912  (e.g., the shield  5920  is bent inward relative to the dividing tube body  5902 , etc.). The shield  5920  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  5912  via the dividing tube inlet aperture  5910 . 
     The exhaust gas exits the dividing tube cavity  5912  via a dividing tube outlet aperture  5922  and flows towards the SCR catalyst members  216 . 
     In some embodiments, the dividing tube body  5902 , the first dividing tube flange  5904 , and the second dividing tube flange  5906  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). For example, the first dividing tube flange  5904  may include features (e.g., protrusions, projections, ribs, flanges, fins, etc.) that extend towards the SCR catalyst members  216  such that the exhaust gas flowing out of the dividing tube outlet aperture  5922  flows against and/or between the features and is directed towards the SCR catalyst members  216  and/or distributed between the SCR catalyst members  216 . 
     The dividing tube outlet aperture  5922  is positioned proximate the first end  5905 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  5910  to the dividing tube outlet aperture  5922  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  5922  is first swirled by the dividing tube body  5902 . Furthermore, due to the dividing tube inlet aperture  5910  being positioned proximate the second end and the dividing tube outlet aperture  5922  being positioned proximate the first end  5905 , a distance between the dividing tube inlet aperture  5910  and the dividing tube outlet aperture  5922  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  5912  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The first dividing tube flange perforations  5914  are disposed on a portion of the first dividing tube flange  5904  that is opposite the dividing tube cavity  5912  (e.g., are located opposite the first end  5905 , etc.). In operation, the first dividing tube flange perforation  5914  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  5904 , etc.) through the first dividing tube flange  5904  and into the dividing tube cavity  5912  without passing through the dividing tube inlet aperture  5910 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first dividing tube flange perforation  5914  functions to heat the first end  5905 , thereby mitigating impingement of the reductant on the first end  5905 . The exhaust gas flowing through the first dividing tube flange perforation  5914  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  5912  towards the dividing tube outlet aperture  5922 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     Due to the tapering of the dividing tube body  5902 , the dividing tube body  5902  may function to increase velocity of the exhaust gas at locations where impingement is more likely, such as downstream of the second dividing tube flange aperture  5918  and upstream of the dividing tube outlet aperture  5922 . This tapering of the dividing tube body  5902  may also facilitate enhanced reduction of NO x  emissions. 
     Additionally, the tapering of the dividing tube body  5902  may facilitate passage of the exhaust gas between the dividing tube body  5902  and the outer housing wall  232 . This exhaust gas may heat the dividing tube  5900  and mitigate formation of deposits on the dividing tube  5900 . 
       FIG.  61    illustrates the dividing tube body  5902  according to various embodiments. In these embodiments, the dividing tube body  5902  also includes an outlet lip  6100 . The outlet lip  6100  is coupled to the first dividing tube flange  5904  and the dividing tube body  5902 . The outlet lip  6100  is configured to facilitate enhanced mixing of the exhaust gas and the reductant downstream of the dividing tube outlet aperture  5922 . 
     The outlet lip  6100  includes an outlet lip planar portion  6102 . The outlet lip planar portion  6102  is configured to be in confronting relation with the mixing collector wall  226 . The outlet lip  6100  also includes an outlet lip curved portion  6104 . The outlet lip curved portion  6104  is configured to curve away from the mixing collector wall  226  and towards the outer housing wall  232 . The outlet lip curved portion  6104  is contiguous with the outlet lip planar portion  6102  and is separated from the first dividing tube flange  5904  by the outlet lip planar portion  6102 . 
     The outlet lip  6100  also includes a plurality of outlet lip perforations  6106  (e.g., openings, holes, etc.). Each of the outlet lip perforations  6106  is configured to facilitate passage of the exhaust gas through the outlet lip  6100 . In this way, the outlet lip may enhance mixing of the exhaust gas and reductant, decrease the backpressure of the decomposition chamber  108 , and/or increase the UI of the exhaust gas. XXVI. Example Decomposition Chamber Having a Twenty-Third Example Mixing Assembly 
       FIGS.  62 - 63 C  illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  6200 . 
     As is explained in more detail below, the dividing tube  6200  includes a first portion  6202  that receives a portion of the exhaust gas and a second portion  6204  that provides all of the exhaust gas to the SCR catalyst members  216 . The dividing tube  6200  may be implemented in the decomposition chamber  108  in place of any of the dividing tubes previously described, such as the dividing tube  800 , the dividing tube  1300 , the dividing tube  2800 , the dividing tube  4500 , the dividing tube  4600 , the dividing tube  5100 , the dividing tube  5800 , or the dividing tube  5900 . 
     The dividing tube  6200  includes a dividing tube body  6205  (e.g., frame, shell, etc.). The dividing tube body  6205  is generally cylindrical, oval, or oblong. Rather than the dividing tube body  6205  being coupled to the mixing assembly wall  230  about an aperture, the dividing tube body  6205  is integrally formed with the mixing assembly wall  230 . For example, the mixing assembly wall  230  may be variously bent and formed so as to create the dividing tube body  6205  (e.g., using a punch, etc.). 
     The dividing tube  6200  also includes a first dividing tube flange  6206  (e.g., wall, divider, etc.). The first dividing tube flange  6206  is coupled (e.g., a first portion of the first dividing tube flange  6206  is coupled to, etc.) to a first end  6207  of the dividing tube body  6205  (e.g., such that flow of the exhaust gas between the first end  6207  and the first dividing tube flange  6206  is substantially prohibited, etc.). The first dividing tube flange  6206  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  6206  is substantially prohibited, etc.). 
     In some embodiments, the dividing tube  6200  also includes a cap (e.g., panel, wall, divider, etc.). The cap is coupled to the first end  6207  (e.g., such that flow of the exhaust gas between the first end  6207  and the cap is substantially prohibited, etc.). The cap is also coupled to the first dividing tube flange  6206  (e.g., such that flow of the exhaust gas between the first dividing tube flange  6206  and the cap is substantially prohibited, etc.). 
     The dividing tube  6200  also includes a dividing tube panel  6210  (e.g., wall, divider, etc.). The dividing tube panel  6210  is integrally formed with the dividing tube body  6205 . The dividing tube panel  6210  is coupled to the first dividing tube flange  6206  (e.g., such that flow of the exhaust gas between the first dividing tube flange  6206  and the dividing tube panel  6210  is substantially prohibited, etc.). 
     The dividing tube  6200  also includes a dividing tube endplate  6212  (e.g., panel, wall, divider, etc.). The dividing tube endplate  6212  is integrally formed with the dividing tube panel  6210 . In various embodiments, an edge between the dividing tube panel  6210  and the dividing tube endplate  6212  is rounded. As a result, recirculation zones may be decreased. 
     The dividing tube endplate  6212  is also coupled to the first dividing tube flange  6206  (e.g., such that flow of the exhaust gas between the first dividing tube flange  6206  and the dividing tube endplate  6212  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube endplate  6212  and the first dividing tube flange  6206  is rounded. As a result, recirculation zones may be decreased. 
     The dividing tube endplate  6212  is also integrally formed with the mixing collector wall  226 . In various embodiments, an edge between the dividing tube endplate  6212  and the mixing collector wall  226  is rounded. As a result, recirculation zones may be decreased. 
     In various embodiments, the dividing tube endplate  6212  is disposed along a first plane and the dividing tube panel  6210  is disposed along a second plane that is separated from the first plane by an angular separation that is not equal to 90°. In various embodiments, the angular separation is equal to between approximately 20° and 70°, inclusive (e.g., 19°, 20°, 21°, 30°, 40°, 45°, 50°, 60°, 67°, 70°, 73°, etc.). In other embodiments, the angular separation is approximately equal to 90°. 
     The dividing tube  6200  also includes a second dividing tube flange  6214  (e.g., wall, divider, etc.). The second dividing tube flange  6214  is coupled (e.g., a first portion of the second dividing tube flange  6214  is coupled to, etc.) to a second end  6216  of the dividing tube body  6205  (e.g., such that flow of the exhaust gas between the second end  6216  and the second dividing tube flange  6214  is substantially prohibited, etc.). The second end  6216  is opposite the first end  6207 . 
     The second dividing tube flange  6214  is also coupled to the dividing tube panel  6210  (e.g., such that flow of the exhaust gas between the dividing tube panel  6210  and the second dividing tube flange  6214  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube panel  6210  and the second dividing tube flange  6214  is rounded. As a result, recirculation zones may be decreased. 
     The second dividing tube flange  6214  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  6214  is substantially prohibited, etc.). In various embodiments, an edge between the mixing collector wall  226  and the second dividing tube flange  6214  is rounded. As a result, recirculation zones may be decreased. 
     The first end  6207  may include tabs that are configured to be received within slots within the first dividing tube flange  6206  to facilitate coupling of the dividing tube body  6205  to the first dividing tube flange  6206 . The second end  6216  may include tabs that are configured to be received within slots within the second dividing tube flange  6214  to facilitate coupling of the dividing tube body  6205  to the second dividing tube flange  6214 . 
     The dividing tube  6200  establishes a concentration cavity. The concentration cavity is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  6205 , the first dividing tube flange  6206 , the dividing tube panel  6210 , the dividing tube endplate  6212 , and the second dividing tube flange  6214 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  6205  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  6205  via a dividing tube inlet aperture  6230  (e.g., hole, opening, etc.) formed in the dividing tube body  6205 . The dividing tube inlet aperture  6230  is located between the outer housing wall  232  and a location at which the dividing tube panel  6210  couples to the dividing tube body  6205 . After flowing through the dividing tube inlet aperture  6230 , the exhaust gas enters a dividing tube cavity  6232  defined by the dividing tube body  6205 . 
     Second, the exhaust gas may enter the dividing tube body  6205  via a first dividing tube flange opening  6236  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  6206  may include a plurality of the first dividing tube flange openings  6236 . According to various embodiments, each of the first dividing tube flange openings  6236  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  6207 . After flowing through the first dividing tube flange openings  6236 , the exhaust gas enters the dividing tube cavity  6232 . 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  6205  via a second dividing tube flange aperture  6238  (e.g., hole, opening, etc.). The second dividing tube flange aperture  6238  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  6216 . After flowing through the second dividing tube flange aperture  6238 , the reductant enters the dividing tube cavity  6232 . 
     In some embodiments, the exhaust gas may enter the dividing tube body  6205  via a dividing tube body perforation (e.g., hole, aperture, opening, etc.) formed in the dividing tube body  6205 . The dividing tube body  6205  may include a plurality of the dividing tube body perforations. According to various embodiments, each of the dividing tube body perforations is positioned between the dividing tube inlet aperture  6230  and the first dividing tube flange  6206 . After flowing through the dividing tube body perforation, the exhaust gas enters the dividing tube cavity  6232 . 
     The dividing tube inlet aperture  6230  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  6232  than the first dividing tube flange openings  6236 . At least a portion of the dividing tube inlet aperture  6230  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the dividing tube inlet aperture  6230  enters the dividing tube cavity  6232  radially (e.g., along a tangent of the dividing tube body  6205 , along a line that is parallel to and offset from a tangent of the dividing tube body  6205 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  6232 . The swirl imparted by the dividing tube inlet aperture  6230  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  6232  and ensures shear on the dividing tube body  6205  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  6205 . 
     The dividing tube  6200  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture  6238  and spaced from the second dividing tube flange  6214 . As a result, the injection region  314  is located within the dividing tube cavity  6232  and the concentration cavity. 
     In various embodiments, the dividing tube body  6205  includes a shield  6240  (e.g., wall, projection, etc.). The shield  6240  is contiguous with the dividing tube inlet aperture  6230  and extends into the dividing tube cavity  6232  (e.g., the shield  6240  is bent inward relative to the dividing tube body  6205 , etc.). The shield  6240  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  6232  via the dividing tube inlet aperture  6230 . 
     The exhaust gas exits the dividing tube cavity  6232  via a dividing tube outlet aperture  6242  and flows towards the SCR catalyst members  216 . The exhaust gas flowing out of the dividing tube outlet aperture  6242  flows between the dividing tube body  6205 , the first dividing tube flange  6206 , the dividing tube panel  6210 , the dividing tube endplate  6212 , and the second dividing tube flange  6214  (e.g., into a recess formed by the dividing tube body  6205 , the first dividing tube flange  6206 , the dividing tube panel  6210 , the dividing tube endplate  6212 , and the second dividing tube flange  6214  in the mixing collector wall  226 ). The dividing tube body  6205 , the first dividing tube flange  6206 , the dividing tube panel  6210 , the dividing tube endplate  6212 , and the second dividing tube flange  6214  create a volume within which the exhaust gas exiting the dividing tube outlet aperture  6242  can expand, thereby minimizing backpressure of the decomposition chamber  108 , facilitating increased UI of the reductant and exhaust gas, and facilitating increased flow distribution index of the exhaust gas. 
     In some embodiments, the dividing tube body  6205 , the first dividing tube flange  6206 , the dividing tube panel  6210 , the dividing tube endplate  6212 , and the second dividing tube flange  6214  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). For example, the dividing tube panel  6210  may include features (e.g., protrusions, projections, ribs, flanges, fins, etc.) that extend towards the SCR catalyst members  216  such that the exhaust gas flowing out of the dividing tube outlet aperture  6242  flows against and/or between the features and is directed towards the SCR catalyst members  216  and/or distributed between the SCR catalyst members  216 . 
     The dividing tube outlet aperture  6242  is positioned proximate the first end  6207 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  6230  to the dividing tube outlet aperture  6242  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  6242  is first swirled by the dividing tube body  6205 . Furthermore, due to the dividing tube inlet aperture  6230  being positioned proximate the second end  6216  and the dividing tube outlet aperture  6242  being positioned proximate the first end  6207 , a distance between the dividing tube inlet aperture  6230  and the dividing tube outlet aperture  6242  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  6232  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     In various embodiments, such as is shown in  FIG.  63 B , the exhaust gas may enter the dividing tube body  6205  via a dividing tube body bypass opening  6300  (e.g., window, etc.). The dividing tube body bypass opening  6300  is disposed proximate the second end  6216  and enables a portion of the exhaust gas to flow into the dividing tube cavity  6232  downstream of the dividing tube inlet aperture  6230 . For example, exhaust gas may flow across the dividing tube body  6205 , between the dividing tube body  6205  and the outer housing wall  232 , between the dividing tube body  6205  and the mixing assembly wall  230 , and through the dividing tube body  6205  via the dividing tube body bypass opening  6300 . XXVII. Example Decomposition Chamber Having a Twenty-Fourth Example Mixing Assembly 
       FIGS.  64 - 80    illustrate a dividing tube  6400  for the decomposition chamber  108  according to various embodiments. The dividing tube  6400  may be implemented in the decomposition chamber  108  in place of any of the dividing tubes previously described, such as the dividing tube  800 , the dividing tube  1300 , the dividing tube  2800 , the dividing tube  4500 , the dividing tube  4600 , the dividing tube  5100 , the dividing tube  5800 , the dividing tube  5900 , or the dividing tube  6200 . 
     The dividing tube  6400  includes a dividing tube body  6402  (e.g., frame, shell, etc.). The dividing tube body  6402  is generally cylindrical, oval, or oblong. In various embodiments, the dividing tube body  6402  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  6402  and the mixing assembly wall  230  is substantially prohibited, etc.) and/or the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  6402  and the mixing collector wall  226  is substantially prohibited, etc.). In various embodiments, the dividing tube body  6402  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  6402  and the outer housing wall  232  is facilitated, etc.). 
     The dividing tube body  6402  is coupled to the mixing collector wall  226  around a dividing tube coupler aperture  6403  (e.g., hole, opening, etc.) in the mixing collector wall  226 . In some embodiments, the dividing tube body  6402  is positioned within the dividing tube coupler aperture  6403  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  6402 , etc.). In other embodiments, the dividing tube body  6402  is in confronting relation with the dividing tube coupler aperture  6403 . 
     The dividing tube  6400  also includes a first dividing tube flange  6404  (e.g., wall, divider, etc.). The first dividing tube flange  6404  is coupled (e.g., a first portion of the first dividing tube flange  6404  is coupled to, etc.) to a first end  6406  of the dividing tube body  6402  (e.g., such that flow of the exhaust gas between the first end  6406  and the first dividing tube flange  6404  is substantially prohibited, etc.). The first dividing tube flange  6404  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  6404  is substantially prohibited, etc.). 
     In various embodiments, the first dividing tube flange  6404  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  6403  (e.g., along a side of the dividing tube coupler aperture  6403 , etc.). In various embodiments, the first dividing tube flange  6404  is not positioned within the dividing tube coupler aperture  6403 . 
     In some embodiments, the dividing tube  6400  also includes a cap (e.g., panel, wall, divider, etc.). The cap is coupled to the first end  6406  (e.g., such that flow of the exhaust gas between the first end  6406  and the cap is substantially prohibited, etc.). The cap is also coupled to the first dividing tube flange  6404  (e.g., such that flow of the exhaust gas between the first dividing tube flange  6404  and the cap is substantially prohibited, etc.). 
     The dividing tube  6400  also includes a dividing tube panel  6410  (e.g., wall, divider, etc.). The dividing tube panel  6410  is coupled to the dividing tube body  6402  (e.g., such that flow of the exhaust gas between the dividing tube body  6402  and the dividing tube panel  6410  is substantially prohibited, etc.). The dividing tube panel  6410  is also coupled to the first dividing tube flange  6404  (e.g., such that flow of the exhaust gas between the first dividing tube flange  6404  and the dividing tube panel  6410  is substantially prohibited, etc.). 
     The dividing tube  6400  also includes a dividing tube endplate  6412  (e.g., panel, wall, divider, etc.). The dividing tube endplate  6412  is coupled to the dividing tube panel  6410  (e.g., such that flow of the exhaust gas between the dividing tube panel  6410  and the dividing tube endplate  6412  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube panel  6410  and the dividing tube endplate  6412  is rounded. As a result, recirculation zones may be decreased. 
     The dividing tube endplate  6412  is also coupled to the first dividing tube flange  6404  (e.g., such that flow of the exhaust gas between the first dividing tube flange  6404  and the dividing tube endplate  6412  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube endplate  6412  and the first dividing tube flange  6404  is rounded. As a result, recirculation zones may be decreased. 
     The dividing tube endplate  6412  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube endplate  6412  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube endplate  6412  and the mixing collector wall  226  is rounded. As a result, recirculation zones may be decreased. 
     In various embodiments, the dividing tube endplate  6412  is disposed along a first plane and the dividing tube panel  6410  is disposed along a second plane that is separated from the first plane by an angular separation that is not equal to 90°. In various embodiments, the angular separation is equal to between approximately 20° and 70°, inclusive (e.g., 19°, 20°, 21°, 30°, 40°, 45°, 50°, 60°, 67°, 70°, 73°, etc.). In other embodiments, the angular separation is approximately equal to 90°. 
     In various embodiments, the dividing tube endplate  6412  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  6403  (e.g., along a side of the dividing tube coupler aperture  6403 , etc.). In various embodiments, the dividing tube endplate  6412  is not positioned within the dividing tube coupler aperture  6403 . 
     The dividing tube  6400  also includes a second dividing tube flange  6414  (e.g., wall, divider, etc.). The second dividing tube flange  6414  is coupled (e.g., a first portion of the second dividing tube flange  6414  is coupled to, etc.) to a second end  6416  of the dividing tube body  6402  (e.g., such that flow of the exhaust gas between the second end  6416  and the second dividing tube flange  6414  is substantially prohibited, etc.). The second end  6416  is opposite the first end  6406 . 
     The second dividing tube flange  6414  is also coupled to the dividing tube panel  6410  (e.g., such that flow of the exhaust gas between the dividing tube panel  6410  and the second dividing tube flange  6414  is substantially prohibited, etc.). In various embodiments, an edge between the dividing tube panel  6410  and the second dividing tube flange  6414  is rounded. As a result, recirculation zones may be decreased. 
     The second dividing tube flange  6414  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  6414  is substantially prohibited, etc.). In various embodiments, an edge between the mixing collector wall  226  and the second dividing tube flange  6414  is rounded. As a result, recirculation zones may be decreased. 
     The first end  6406  may include tabs that are configured to be received within slots within the first dividing tube flange  6404  to facilitate coupling of the dividing tube body  6402  to the first dividing tube flange  6404 . The second end  6416  may include tabs that are configured to be received within slots within the second dividing tube flange  6414  to facilitate coupling of the dividing tube body  6402  to the second dividing tube flange  6414 . 
     In various embodiments, the second dividing tube flange  6414  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  6403  (e.g., along a side of the dividing tube coupler aperture  6403 , etc.). In various embodiments, the second dividing tube flange  6414  is not positioned within the dividing tube coupler aperture  6403 . 
     The dividing tube  6400  also includes a dividing tube collector  6418  (e.g., scoop, panel, etc.). The dividing tube collector  6418  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube collector  6418  is substantially prohibited, etc.). In some embodiments, the dividing tube collector  6418  is coupled to the mixing collector wall  226  such that a portion of the dividing tube body  6402  is positioned within and/or adjacent to the dividing tube collector  6418 . 
     In various embodiments, the dividing tube collector  6418  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  6403  (e.g., along a side of the dividing tube coupler aperture  6403 , etc.). In various embodiments, the dividing tube collector  6418  is not positioned within the dividing tube coupler aperture  6403 . 
     The dividing tube  6400  also includes a dividing tube dividing wall  6420  (e.g., flange, divider, etc.). The dividing tube dividing wall  6420  is coupled to the dividing tube body  6402  (e.g., such that flow of the exhaust gas between the dividing tube dividing wall  6420  and the dividing tube body  6402  is substantially prohibited, etc.). The dividing tube dividing wall  6420  is also coupled to the dividing tube collector  6418  (e.g., such that flow of the exhaust gas between the dividing tube dividing wall  6420  and the dividing tube collector  6418  is substantially prohibited, etc.). The dividing tube dividing wall  6420  may be positioned within the dividing tube coupler aperture  6403 . 
     In various embodiments, the dividing tube  6400  also includes a dividing tube guide  6422  (e.g., scoop, vane, etc.). The dividing tube guide  6422  is configured to guide the exhaust gas flowing out of the dividing tube  6400  downstream. The dividing tube guide  6422  includes a dividing tube guide directing wall  6424  (e.g., flange, panel, etc.). The dividing tube guide directing wall  6424  is coupled to the dividing tube dividing wall  6420  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  6424  and the dividing tube dividing wall  6420  is substantially prohibited, etc.). In various embodiments, the dividing tube guide directing wall  6424  is additionally coupled to the dividing tube body  6402  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  6424  and the dividing tube body  6402  is substantially prohibited, etc.). The dividing tube guide directing wall  6424  may be positioned within the dividing tube coupler aperture  6403 . In some embodiments, the dividing tube guide  6422  includes a plurality of dividing tube guide directing walls  6424 , such that the exhaust gas may flow between adjacent dividing tube guide directing walls  6424 . By including multiple dividing tube guide directing walls  6424 , the dividing tube  6400  may provide an increased control over a flow of the exhaust gas. 
     In various embodiments, the dividing tube guide  6422  also includes a dividing tube guide dividing wall  6426  (e.g., flange, panel, etc.). The dividing tube guide dividing wall  6426  is coupled to the dividing tube guide directing wall  6424  (e.g., such that flow of the exhaust gas between the dividing tube guide directing wall  6424  and the dividing tube guide dividing wall  6426  is substantially prohibited, etc.). The dividing tube guide dividing wall  6426  may be positioned within the dividing tube coupler aperture  6403 . In some embodiments, the dividing tube guide  6422  does not include the dividing tube guide dividing wall  6426 . In some embodiments, the dividing tube  6400  does not include the dividing tube guide  6422 . 
     The dividing tube  6400  establishes a concentration cavity. The concentration cavity is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  6402 , the first dividing tube flange  6404 , the dividing tube panel  6410 , the dividing tube endplate  6412 , and the second dividing tube flange  6414 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  6402  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  6402  via a dividing tube inlet aperture  6430  (e.g., hole, opening, etc.) formed in the dividing tube body  6402 . The dividing tube inlet aperture  6430  is located between the outer housing wall  232  and a location at which the dividing tube panel  6410  couples to the dividing tube body  6402 . After flowing through the dividing tube inlet aperture  6430 , the exhaust gas enters a dividing tube cavity  6432  defined by the dividing tube body  6402 . 
     Second, the exhaust gas may enter the dividing tube body  6402  via a first dividing tube flange opening  6436  (e.g., hole, aperture, opening, etc.). The first dividing tube flange  6404  includes a plurality of the first dividing tube flange openings  6436 . According to various embodiments, each of the first dividing tube flange openings  6436  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the first end  6406 . After flowing through the first dividing tube flange openings  6436 , the exhaust gas enters the dividing tube cavity  6432 . 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  6402  via a second dividing tube flange aperture  6438  (e.g., hole, opening, etc.). The second dividing tube flange aperture  6438  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  6416 . After flowing through the second dividing tube flange aperture  6438 , the reductant enters the dividing tube cavity  6432 . 
     In some embodiments, the exhaust gas may enter the dividing tube body  6402  via a dividing tube body perforation (e.g., hole, aperture, opening, etc.) formed in the dividing tube body  6402 . The dividing tube body  6402  may include a plurality of the dividing tube body perforations. According to various embodiments, each of the dividing tube body perforations is positioned between the dividing tube inlet aperture  6430  and the first dividing tube flange  6404 . After flowing through the dividing tube body perforation, the exhaust gas enters the dividing tube cavity  6432 . 
     The dividing tube inlet aperture  6430  is sized and positioned so as to provide more exhaust gas into the dividing tube cavity  6432  than the first dividing tube flange openings  6436 . At least a portion of the dividing tube inlet aperture  6430  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the dividing tube inlet aperture  6430  enters the dividing tube cavity  6432  radially (e.g., along a tangent of the dividing tube body  6402 , along a line that is parallel to and offset from a tangent of the dividing tube body  6402 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  6432 . The swirl imparted by the dividing tube inlet aperture  6430  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  6432  and ensures shear on the dividing tube body  6402  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  6402 . 
     The dividing tube  6400  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture  6438  and spaced from the second dividing tube flange  6414 . As a result, the injection region  314  is located within the dividing tube cavity  6432  and the concentration cavity. 
     In various embodiments, the dividing tube body  6402  includes a shield  6440  (e.g., wall, projection, etc.). The shield  6440  is contiguous with the dividing tube inlet aperture  6430  and extends into the dividing tube cavity  6432  (e.g., the shield  6440  is bent inward relative to the dividing tube body  6402 , etc.). The shield  6440  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  6432  via the dividing tube inlet aperture  6430 . 
     The exhaust gas exits the dividing tube cavity  6432  via a dividing tube outlet aperture  6442  and flows towards the SCR catalyst members  216 . The exhaust gas flowing out of the dividing tube outlet aperture  6442  flows between the dividing tube body  6402 , the first dividing tube flange  6404 , the dividing tube panel  6410 , the dividing tube endplate  6412 , and the second dividing tube flange  6414  (e.g., into a recess formed by the dividing tube body  6402 , the first dividing tube flange  6404 , the dividing tube panel  6410 , the dividing tube endplate  6412 , and the second dividing tube flange  6414  in the mixing collector wall  226 ). The dividing tube body  6402 , the first dividing tube flange  6404 , the dividing tube panel  6410 , the dividing tube endplate  6412 , and the second dividing tube flange  6414  create a volume within which the exhaust gas exiting the dividing tube outlet aperture  6442  can expand, thereby minimizing backpressure of the decomposition chamber  108 , facilitating increased UI of the reductant and exhaust gas, and facilitating increased flow distribution index of the exhaust gas. 
     In some embodiments, the dividing tube body  6402 , the first dividing tube flange  6404 , the dividing tube panel  6410 , the dividing tube endplate  6412 , and the second dividing tube flange  6414  are variously shaped, sized, or otherwise configured to direct the exhaust gas towards the SCR catalyst members  216  and/or distribute the exhaust gas between the SCR catalyst members  216  (e.g., with a target distribution profile, etc.). For example, the dividing tube panel  6410  may include features (e.g., protrusions, projections, ribs, flanges, fins, etc.) that extend towards the SCR catalyst members  216  such that the exhaust gas flowing out of the dividing tube outlet aperture  6442  flows against and/or between the features and is directed towards the SCR catalyst members  216  and/or distributed between the SCR catalyst members  216 . 
     As the exhaust gas flows towards the SCR catalyst members  216 , a portion of the exhaust gas may flow into a dividing tube collector cavity  6444  defined by the dividing tube collector  6418 . A portion of the exhaust gas flowing within the dividing tube collector cavity  6444  is directed by the dividing tube guide  6422  out of the dividing tube collector cavity  6444  towards the SCR catalyst members  216 . Another portion of the exhaust gas flowing within the dividing tube collector cavity  6444  flows out of the dividing tube collector cavity  6444  via dividing tube dividing wall perforations  6446  (e.g., holes, openings, etc.) in the dividing tube dividing wall  6420 . The additional exit for the exhaust gas from the dividing tube collector cavity  6444  provided by the dividing tube dividing wall perforations  6446  minimizes backpressure of the decomposition chamber  108 . 
     In some embodiments, the outer housing wall  232  is spaced apart from the dividing tube body  6402 . As a result, a portion of the exhaust gas flows between the outer housing wall  232  and the dividing tube body  6402 , along the dividing tube body  6402 , between the dividing tube body  6402  and the mixing assembly wall  230 , and into the dividing tube collector cavity  6444 . Therefore, exhaust gas may flow into the dividing tube collector cavity  6444  either from the dividing tube outlet aperture  6442  or after flowing around the dividing tube body  6402 . As a result, the backpressure of the decomposition chamber  108  may be decreased. The exhaust gas flowing around the dividing tube body  6402  functions to heat the dividing tube body  6402 , thereby mitigating impingement of the reductant on the dividing tube body  6402 . Further, the exhaust gas flowing around the dividing tube body  6402  causes the exhaust gas within the dividing tube collector cavity  6444  to be propelled out of the dividing tube collector cavity  6444 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The dividing tube outlet aperture  6442  is positioned proximate the first end  6406 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  6430  to the dividing tube outlet aperture  6442  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  6442  is first swirled by the dividing tube body  6402 . Furthermore, due to the dividing tube inlet aperture  6430  being positioned proximate the second end  6416  and the dividing tube outlet aperture  6442  being positioned proximate the first end  6406 , a distance between the dividing tube inlet aperture  6430  and the dividing tube outlet aperture  6442  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  6432  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The first dividing tube flange openings  6436  are disposed on a portion of the first dividing tube flange  6404  that is opposite the dividing tube cavity  6432  (e.g., are located opposite the first end  6406 , etc.). In operation, the first dividing tube flange opening  6436  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube flange  6404 , etc.) through the first dividing tube flange  6404  and into the dividing tube cavity  6432  without passing through the dividing tube inlet aperture  6430 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first dividing tube flange opening  6436  functions to heat the first end  6406 , thereby mitigating impingement of the reductant on the first end  6406 . The exhaust gas flowing through the first dividing tube flange opening  6436  may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  6432  towards the dividing tube outlet aperture  6442 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the first dividing tube flange  6404  includes a plurality of nozzles  6448  (e.g., concentrators, jets, etc.). Each of the nozzles  6448  extends around one of the first dividing tube flange openings  6436  and projects from the first dividing tube flange  6404  into the dividing tube cavity  6432 . The nozzles  6448  function to increase momentum and/or velocity of the exhaust gas propelled through the first dividing tube flange openings  6436 . In this way, the first dividing tube flange openings  6436  may assist in directing the exhaust gas and the reductant out of the dividing tube cavity  6432  and mitigate formation of deposits on the first dividing tube flange  6404 . 
     In some embodiments, the first dividing tube flange  6404  does not include any of the first dividing tube flange openings  6436  or any of the nozzles  6448 . As a result, all of the exhaust gas that flow through the dividing tube cavity  6432  enters via the dividing tube inlet aperture  6430 . 
     The dividing tube  6400  also includes a recessed inlet  6450  (e.g., ramp, etc.). The recessed inlet  6450  is disposed within the dividing tube panel  6410  and is aligned with the dividing tube inlet aperture  6430 . The recessed inlet  6450  is configured to direct the exhaust gas into the dividing tube inlet aperture  6430 . 
       FIGS.  67 - 71    illustrate the dividing tube  6400  according to various embodiments. In these embodiments, the dividing tube  6400  includes an outlet shell  6700 . The outlet shell  6700  is coupled to the dividing tube body  6402 . The outlet shell  6700  provides an outlet shell cavity  6702  that is contiguous with the dividing tube cavity  6432 . The exhaust gas may flow from the dividing tube inlet aperture  6430  into the outlet shell cavity  6702  and from the first dividing tube flange openings  6436  into the outlet shell cavity  6702 . The exhaust gas provided by the dividing tube outlet aperture  6442  may flow from the outlet shell cavity  6702 . The outlet shell cavity  6702  may provide an increased volume for the exhaust gas to swirl within the dividing tube  6400 . In this way, the outlet shell  6700  may facilitate enhanced mixing of the reductant and the exhaust gas. 
     In various embodiments, such as is shown in  FIG.  69   , the dividing tube  5400  also includes a blocking panel  6900 . The blocking panel  6900  is contiguous with the dividing tube outlet aperture  6442  and extends from the dividing tube body  6402  towards the first dividing tube flange  6404 . The blocking panel  6900  may provide additional swirling to the exhaust gas. 
     In some embodiments, such as is shown in  FIGS.  67 - 69   , the outlet shell  6700  forms at least part of a trapezoid. In other embodiments, such as is shown in  FIGS.  70 - 72   , the outlet shell forms at least part of a cuboid. 
     In some embodiments, such as shown in  FIG.  70   , the dividing tube panel  6410  extends along more than one side of the recessed inlet  6450 . In other embodiments, such as shown in  FIG.  72   , the dividing tube panel  6410  extends along only one side of the recessed inlet  6450 . 
     In some embodiments, such as is shown in  FIG.  71   , the exhaust gas may enter the dividing tube body  6402  via a dividing tube body bypass opening  7100  (e.g., window, etc.). The dividing tube body bypass opening  7100  is disposed proximate the first end  6406  and enables a portion of the exhaust gas to flow into the dividing tube cavity  6432  downstream of the dividing tube inlet aperture  6430 . 
     In various embodiments, such as is shown in  FIGS.  73 ,  74 , and  76   , the blocking panel  6900  includes a sloped surface  7300 . The sloped surface  7300  is contiguous with the dividing tube body  6802 , the dividing tube panel  6410 , and a blocking panel outer housing surface  7302  of the blocking panel  6900 . The blocking panel outer housing surface  7302  is in confronting relation with the outer housing wall  232 . The sloped surface  7300  slopes from the blocking panel outer housing surface  7302  to the dividing tube panel  6410 . The sloped surface  7300  directs a portion of the exhaust gas away from some of the SCR catalyst members  216  and towards others of the SCR catalyst members  216 . In this way, the sloped surface  7300  may be used to, for example, balance the exhaust gas being provided to all of the SCR catalyst members  216 . 
     In various embodiments, such as is shown in  FIG.  74   , the blocking panel  6900  includes a blocking panel trough  7400  (e.g., recession, etc.). The blocking panel trough  7400  extends towards the dividing tube body  6402 . The blocking panel trough  7400  is disposed within a blocking panel upstream surface  7402  of the blocking panel  6900 . The blocking panel upstream surface  7402  is contiguous with the mixing collector wall  226 , the blocking panel outer housing surface  7302 , and the sloped surface  7300 . The blocking panel trough  7400  causes the exhaust gas flow to be redirected (e.g., within the dividing tube cavity  6432 , etc.). In this way, the blocking panel trough  7400  may be used to, for example, balance the exhaust gas being provided to all of the SCR catalyst members  216 . 
     In some embodiments, such as is shown in  FIG.  74   , the first dividing tube flange  6404  includes a first dividing tube flange trough  7406  (e.g., recession, etc.). The first dividing tube flange trough  7406  extends towards the second end  6416 . The first dividing tube flange trough  7406  causes the exhaust gas flow to be redirected (e.g., within the dividing tube cavity  6432 , etc.). In this way, the first dividing tube flange trough  7406  may be used to, for example, balance the exhaust gas being provided to all of the SCR catalyst members  216 . In some embodiments, the first dividing tube flange trough  7406  is aligned with the blocking panel trough  7400  (e.g., a center axis of the first dividing tube flange trough  7406  is disposed along the same plane along which a center axis of the blocking panel trough  7400  extends, etc.). 
     In some embodiments, such as is shown in  FIGS.  75 - 78   , the dividing tube body  6402  includes a second dividing tube flange trough  7500  (e.g., recession, etc.). The second dividing tube flange trough  7500  extends across the dividing tube body  6402  proximate the second dividing tube flange  6414 . As a result, the second dividing tube flange trough  7500  provides a pathway for the exhaust gas to flow between the dividing tube body  6402 , the second dividing tube flange  6414 , and the outer housing wall  232 . In this way, the second dividing tube flange trough  7500  may decrease a backpressure of the decomposition chamber  108 . 
     In some embodiments, such as is shown in  FIGS.  76  and  77   , the dividing tube body  6402  includes a first dividing tube flange trough  7600  (e.g., recession, etc.). The first dividing tube flange trough  7600  extends across the dividing tube body  6402  proximate the first dividing tube flange  6404 . As a result, the first dividing tube flange trough  7600  provides a pathway for the exhaust gas to flow between the dividing tube body  6402 , the first dividing tube flange  6404 , and the outer housing wall  232 . In this way, the first dividing tube flange trough  7600  may decrease a backpressure of the decomposition chamber  108 . 
     In various embodiments, such as is shown in  FIGS.  78 - 80   , the dividing tube  6400  also includes an exhaust assist cone  7800  (e.g., exhaust guide, exhaust cone, etc.). The exhaust assist cone  7800  is coupled to the second dividing tube flange  6414  around the second dividing tube flange aperture  6438 . The exhaust assist cone  7800  extends from the second dividing tube flange  6414  into the dividing tube cavity  6432 . As is explained in more detail herein, the exhaust assist cone  7800  is configured to facilitate propulsion of the reductant into the dividing tube cavity  6432  so as to facilitate desirable mixing of the reductant and the exhaust gas within the dividing tub cavity  6432 . 
     The exhaust assist cone  7800  includes at least one exhaust assist aperture  7802  (e.g., opening, hole, etc.), in some embodiments. The exhaust assist apertures  7802  are configured to facilitate passage of exhaust gas into the exhaust assist cone  7800 . The exhaust gas provided into the exhaust assist may be used to propel the reductant out of the exhaust assist cone  7800  and into the dividing tube cavity  6432 . In some embodiments, each of the exhaust assist apertures  7802  is circular and has a diameter that is approximately equal to 5 mm. 
     The dividing tube  6400  may also include a splash plate  7804  (e.g., flange, wall, etc.). The splash plate  7804  is coupled to the dividing tube body  6402  downstream of the exhaust assist cone  7800 . The splash plate  7804  extends across the dividing tube inlet aperture  6430 . As a result, a first portion of the exhaust gas entering the dividing tube inlet aperture  6430  flows between the splash plate  7804  and the second dividing tube flange  6414  (e.g., for provision into the exhaust assist cone  7800  via the exhaust assist apertures  7802 , etc.) and a second portion of the exhaust gas entering the dividing tube inlet aperture  6430  flows between the splash plate  7804  and the outlet shell  6700  (e.g., for provision into the dividing tube cavity  6432 , etc.). The splash plate  7804 , the exhaust assist cone  7800 , and the dividing tube body  6402  may be configured such that the portion of the exhaust gas flowing between the splash plate  7804  and the second dividing tube flange  6414  is caused to swirl around the exhaust assist cone  7800 . As a result, this swirling may be impacted to the reductant flowing out of the exhaust assist cone  7800 . The splash plate  7804  may be configured to mitigate formation of deposits on the dividing tube body  6402 . 
     In various embodiments, the dividing tube body  6402  includes a plurality of dividing tube body apertures  7806  (e.g., holes, windows, etc.). Each of the dividing tube body apertures  7806  is aligned with the splash plate  7804  and is configured to direct exhaust gas into the dividing tube body  6402  proximate the splash plate  7804 . This exhaust gas may flow from between the dividing tube body  6402  and the outer housing wall  232  and may function to heat the splash plate  7804  and mitigate formation of deposits on the splash plate  7804 . 
     XXVIII. Example Decomposition Chamber Having a Twenty-Fifth Example Mixing Assembly 
       FIGS.  81 - 83    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  8100 . 
     The dividing tube  8100  includes a dividing tube body  8102  (e.g., frame, shell, etc.). The dividing tube body  8102  is generally cylindrical, oval, oblong, or stadium-shaped. The dividing tube body  8102  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  8102  and the outer housing wall  232  is facilitated, etc.). 
     The dividing tube body  8102  is positioned over or within a dividing tube coupler aperture  8103  (e.g., hole, opening, etc.) in the mixing collector wall  226  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the dividing tube body  8102 , etc.). The dividing tube body  8102  is coupled to the mixing collector wall  226  around the dividing tube coupler aperture  8103 . 
     The dividing tube  8100  also includes a first dividing tube flange  8104  (e.g., wall, divider, etc.). The first dividing tube flange  8104  is coupled (e.g., a first portion of the first dividing tube flange  8104  is coupled to, etc.) to a first end  8106  of the dividing tube body  8102  (e.g., such that flow of the exhaust gas between the first end  8106  and the first dividing tube flange  8104  is substantially prohibited, etc.). The first dividing tube flange  8104  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube flange  8104  is substantially prohibited, etc.). 
     In various embodiments, the first dividing tube flange  8104  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  8103  (e.g., along a side of the dividing tube coupler aperture  8103 , etc.). In various embodiments, the first dividing tube flange  8104  is not positioned within the dividing tube coupler aperture  8103 . 
     The dividing tube  8100  also includes a blocking panel  8108 . The blocking panel  8108  extends from the dividing tube body  8102  towards the distribution cap  300 . The blocking panel  8108  may provide additional swirling to the exhaust gas. The blocking panel  8108  is contiguous with the first dividing tube flange  8104  and extends away from the first dividing tube flange  8104 . 
     The dividing tube  8100  also includes a second dividing tube flange  8110  (e.g., wall, divider, etc.). The second dividing tube flange  8110  is coupled (e.g., a first portion of the second dividing tube flange  8110  is coupled to, etc.) to a second end  8112  of the dividing tube body  8102  (e.g., such that flow of the exhaust gas between the second end  8112  and the second dividing tube flange  8110  is substantially prohibited, etc.). The second end  8112  is opposite the first end  8106 . The second dividing tube flange  8110  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube flange  8110  is substantially prohibited, etc.). 
     The first end  8106  may include tabs that are configured to be received within slots within the first dividing tube flange  8104  to facilitate coupling of the dividing tube body  8102  to the first dividing tube flange  8104 . The second end  8112  may include tabs that are configured to be received within slots within the second dividing tube flange  8110  to facilitate coupling of the dividing tube body  8102  to the second dividing tube flange  8110 . 
     In various embodiments, the second dividing tube flange  8110  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  8103  (e.g., along a side of the dividing tube coupler aperture  8103 , etc.). In various embodiments, the second dividing tube flange  8110  is not positioned within the dividing tube coupler aperture  8103 . 
     The dividing tube  8100  establishes a concentration cavity. The concentration cavity is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  8102 , the first dividing tube flange  8104 , and the second dividing tube flange  8110 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube body  8102  in one of a variety of different ways. 
     First, the exhaust gas may enter the dividing tube body  8102  via a dividing tube inlet aperture  8114  (e.g., hole, opening, etc.) formed in the dividing tube body  8102 . After flowing through the dividing tube inlet aperture  8114 , the exhaust gas enters a dividing tube cavity  8120  defined by the dividing tube body  8102 . 
     The exhaust gas flowing through the dividing tube inlet aperture  8114  enters the dividing tube cavity  8120  radially (e.g., along a tangent of the dividing tube body  8102 , along a line that is parallel to and offset from a tangent of the dividing tube body  8102 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  8120 . The swirl imparted by the dividing tube inlet aperture  8114  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  8120  and ensures shear on the dividing tube body  8102  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  8102 . 
     Second, the exhaust gas may enter the dividing tube body  8102  via a dividing tube body bypass opening  8116  (e.g., window, etc.). The dividing tube body bypass opening  8116  is disposed proximate the second end  8112  and enables a portion of the exhaust gas to flow into the dividing tube cavity  8120  downstream of the dividing tube inlet aperture  8114 . At least a portion of the exhaust gas flowing between the dividing tube body  8102  and the mixing assembly wall  230  may be directed into the dividing tube body bypass opening  8116 . This exhaust gas may be relatively hot (e.g., compared to exhaust gas that entered the dividing tube body  8102  via the dividing tube inlet aperture  8114 , etc.) and therefore may heat various portions of the dividing tube  8100  which mitigates formation of deposits on the dividing tube  8100 . 
     The exhaust gas flowing through the dividing tube body bypass opening  8116  enters the dividing tube cavity  8120  radially (e.g., along a tangent of the dividing tube body  8102 , along a line that is parallel to and offset from a tangent of the dividing tube body  8102 , etc.). This radial entry causes the exhaust gas to swirl within the dividing tube cavity  8120 . The swirl imparted by the dividing tube body bypass opening  8116  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  8120  and ensures shear on the dividing tube body  8102  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  8102 . In various embodiments, the dividing tube body bypass opening  8116  and the dividing tube inlet aperture  8114  are configured to cause swirling of the exhaust gas in the same direction (e.g., clockwise, counterclockwise, etc.). 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  8102  via a second dividing tube flange aperture  8118  (e.g., hole, opening, etc.). The second dividing tube flange aperture  8118  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  8112 . After flowing through the second dividing tube flange aperture  8118 , the reductant enters the dividing tube cavity  8120 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  8100  is positioned such that the injector coupler  234  is aligned with the second dividing tube flange aperture  8118  and spaced from the second dividing tube flange  8110 . As a result, the injection region  314  is located within the dividing tube cavity  8120  and the concentration cavity. 
     XXIX. Example Decomposition Chamber Having a Twenty-Sixth Example Mixing Assembly 
       FIGS.  84 - 102    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube assembly  8300 . The dividing tube assembly  8300  includes an inlet dividing tube  8302 . The inlet dividing tube  8302  is configured to receive the exhaust gas from within a concentration cavity  8304  established by the dividing tube assembly  8300 . The dividing tube assembly  8300  also includes an outlet dividing tube  8306 . The outlet dividing tube  8306  is coupled to the inlet dividing tube  8302  and is configured to receive the exhaust gas from the inlet dividing tube  8302  and to provide the exhaust gas to the SCR catalyst members  216 . 
     The inlet dividing tube  8302  includes an inlet dividing tube body  8308  (e.g., frame, shell, etc.). The inlet dividing tube body  8308  is generally cylindrical, oval, oblong, or stadium-shaped. The inlet dividing tube body  8308  is separated from the outer housing wall  232  (e.g., such that flow of the exhaust gas between the inlet dividing tube body  8308  and the outer housing wall  232  is facilitated, etc.). 
     The inlet dividing tube body  8308  is positioned within a dividing tube coupler aperture  8310  (e.g., hole, opening, etc.) in the mixing collector wall  226  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the inlet dividing tube body  8308 , etc.). The inlet dividing tube body  8308  is coupled to the mixing collector wall  226  around the dividing tube coupler aperture  8310 . 
     The outlet dividing tube  8306  includes an outlet dividing tube body  8312  (e.g., frame, shell, etc.). The outlet dividing tube body  8312  is generally cylindrical, oval, oblong, or stadium-shaped. The outlet dividing tube body  8312  is positioned within the dividing tube coupler aperture  8310  (e.g., the mixing collector wall  226  is disposed along a plane which bisects the outlet dividing tube body  8312 , etc.). In some embodiments, the outlet dividing tube body  8312  is coupled to the mixing collector wall  226  around the dividing tube coupler aperture  8310 . 
     The dividing tube assembly  8300  also includes a first dividing tube assembly flange  8314  (e.g., wall, divider, etc.). The first dividing tube assembly flange  8314  is coupled (e.g., a first portion of the first dividing tube assembly flange  8314  is coupled to, etc.) to an inlet dividing tube first end  8316  of the inlet dividing tube body  8308  (e.g., such that flow of the exhaust gas between the inlet dividing tube first end  8316  and the first dividing tube assembly flange  8314  is substantially prohibited, etc.). The first dividing tube assembly flange  8314  is also coupled (e.g., a second portion of the first dividing tube assembly flange  8314  is coupled to, etc.) to an outlet dividing tube first end  8318  of the outlet dividing tube body  8312  (e.g., such that flow of the exhaust gas between the outlet dividing tube first end  8318  and the first dividing tube assembly flange  8314  is substantially prohibited, etc.). The first dividing tube assembly flange  8314  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the first dividing tube assembly flange  8314  is substantially prohibited, etc.). 
     In some embodiments, the first dividing tube assembly flange  8314  is entirely planar. In other words, the first dividing tube assembly flange  8314  does not include a bend between two portions of the first dividing tube assembly flange  8314 . These embodiments may provide a significant cost savings compared to other flanges which include a bend. As a result, the decomposition chamber  108  may be more desirable than other systems which use flanges which include a bend. 
     In various embodiments, the first dividing tube assembly flange  8314  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  8310  (e.g., along a side of the dividing tube coupler aperture  8310 , etc.). In various embodiments, the first dividing tube assembly flange  8314  is not positioned within the dividing tube coupler aperture  8310 . 
     The dividing tube assembly  8300  also includes a second dividing tube assembly flange  8320  (e.g., wall, divider, etc.). The second dividing tube assembly flange  8320  is coupled (e.g., a first portion of the second dividing tube assembly flange  8320  is coupled to, etc.) to an inlet dividing tube second end  8322  of the inlet dividing tube body  8308  (e.g., such that flow of the exhaust gas between the inlet dividing tube second end  8322  and the second dividing tube assembly flange  8320  is substantially prohibited, etc.). The second dividing tube assembly flange  8320  is also coupled (e.g., a second portion of the second dividing tube assembly flange  8320  is coupled to, etc.) to an outlet dividing tube second end  8324  of the outlet dividing tube body  8312  (e.g., such that flow of the exhaust gas between the outlet dividing tube second end  8324  and the second dividing tube assembly flange  8320  is substantially prohibited, etc.). The second dividing tube assembly flange  8320  is also coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the second dividing tube assembly flange  8320  is substantially prohibited, etc.). 
     In some embodiments, the second dividing tube assembly flange  8320  is entirely planar. In other words, the second dividing tube assembly flange  8320  does not include a bend between two portions of the second dividing tube assembly flange  8320 . These embodiments may provide a significant cost savings compared to other flanges which include a bend. As a result, the decomposition chamber  108  may be more desirable than other systems which use flanges which include a bend. 
     In various embodiments, the second dividing tube assembly flange  8320  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  8310  (e.g., along a side of the dividing tube coupler aperture  8310 , etc.). In various embodiments, the second dividing tube assembly flange  8320  is not positioned within the dividing tube coupler aperture  8310 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the dividing tube assembly  8300  in one of a variety of different ways. 
     First, the exhaust gas may enter the inlet dividing tube body  8308  via an inlet dividing tube inlet aperture  8326  (e.g., hole, opening, etc.) formed in the inlet dividing tube body  8308 . The inlet dividing tube inlet aperture  8326  is located between the outer housing wall  232  and a location at which the dividing tube panel couples to the inlet dividing tube body  8308 . 
     After flowing through the inlet dividing tube inlet aperture  8326 , the exhaust gas enters an inlet dividing tube cavity  8328  defined by the inlet dividing tube body  8308 . The inlet dividing tube body  8308  is centered on an inlet dividing tube body axis  8330 . The exhaust gas flowing through the inlet dividing tube cavity  8328  may flow in a direction parallel to the inlet dividing tube body axis  8330 . 
     At least a portion of the inlet dividing tube inlet aperture  8326  is located proximate the outer housing wall  232 . As a result, the exhaust gas flowing through the inlet dividing tube inlet aperture  8326  enters the inlet dividing tube cavity  8328  radially (e.g., along a tangent of the inlet dividing tube body  8308 , along a line that is parallel to and offset from a tangent of the inlet dividing tube body  8308 , etc.). This radial entry causes the exhaust gas to swirl within the inlet dividing tube cavity  8328 . The swirl imparted by the inlet dividing tube inlet aperture  8326  facilitates mixing of the exhaust gas and the reductant within the inlet dividing tube cavity  8328  and ensures shear on the inlet dividing tube body  8308  is relatively high, thereby mitigating impingement of the reductant on the inlet dividing tube body  8308 . 
     Second, the exhaust gas may enter the inlet dividing tube body  8308  via a first flange inlet body perforation  8332  (e.g., hole, aperture, opening, etc.). The first dividing tube assembly flange  8314  includes a plurality of the first flange inlet body perforations  8332 . According to various embodiments, each of the first flange inlet body perforations  8332  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the inlet dividing tube first end  8316 . After flowing through the first flange inlet body perforation  8332 , the exhaust gas enters the inlet dividing tube cavity  8328 . 
     The first flange inlet body perforations  8332  are disposed on a portion of the first dividing tube assembly flange  8314  that is opposite the inlet dividing tube cavity  8328 . In operation, the first flange inlet body perforations  8332  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube assembly flange  8314 , etc.) through the first dividing tube assembly flange  8314  and into the inlet dividing tube cavity  8328  without passing through the inlet dividing tube inlet aperture  8326 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first flange inlet body perforations  8332  functions to heat the first dividing tube assembly flange  8314 , thereby mitigating impingement of the reductant on the first dividing tube assembly flange  8314 . The exhaust gas flowing through the first flange inlet body perforations  8332  may also be useful in redirecting the exhaust gas flowing within the inlet dividing tube cavity  8328  towards the outlet dividing tube body  8312 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the inlet dividing tube body  8308  via a second dividing tube assembly flange aperture  8333  (e.g., hole, opening, etc.). The second dividing tube assembly flange aperture  8333  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the inlet dividing tube second end  8322 . After flowing through the second dividing tube assembly flange aperture  8333 , the reductant enters the inlet dividing tube cavity  8328 . 
     The dividing tube assembly  8300  also includes a transfer opening  8334  (e.g., hole, aperture, window, etc.). The transfer opening  8334  is defined by the inlet dividing tube body  8308  and/or the outlet dividing tube body  8312 . The exhaust gas within the inlet dividing tube cavity  8328  flows through the transfer opening  8334  and enters an outlet dividing tube cavity  8336  defined by the outlet dividing tube body  8312 . The outlet dividing tube body  8312  is centered on an outlet dividing tube body axis  8338 . The exhaust gas flowing through the outlet dividing tube cavity  8336  may flow in a direction parallel to the outlet dividing tube body axis  8338 . In some embodiments, the dividing tube assembly  8300  is configured such that the outlet dividing tube body axis  8338  is approximately parallel to (e.g., within 5% of parallel to, etc.) the inlet dividing tube body axis  8330 . 
     Fourth, the exhaust gas may enter the outlet dividing tube body  8312  via a dividing tube body bypass opening  8340  (e.g., window, etc.) included in the outlet dividing tube body  8312 . This exhaust gas may be relatively hot (e.g., compared to exhaust gas that entered the inlet dividing tube body  8308  via the inlet dividing tube inlet aperture  8326 , etc.) and therefore may heat various portions of the dividing tube assembly  8300  which mitigates formation of deposits on the dividing tube assembly  8300 . 
     In various embodiments, such as is shown in  FIGS.  86 ,  87 ,  90 , and  94 - 98   , the dividing tube body bypass opening  8340  is disposed over the outlet dividing tube cavity  8336 . As a result, the exhaust gas flows through the dividing tube body bypass opening  8340  and directly into the outlet dividing tube cavity  8336 . In other embodiments, such as is shown in  FIGS.  99 - 102   , the dividing tube body bypass opening  8340  is disposed over the inlet dividing tube cavity  8328 . As a result, the exhaust gas flows through the dividing tube body bypass opening  8340  and directly into the inlet dividing tube cavity  8328 . In other embodiments, the outlet dividing tube body  8312  does not include the dividing tube body bypass opening  8340 . 
     Fifth, the exhaust gas may enter the outlet dividing tube body  8312  via a first flange outlet body perforation  8342  (e.g., hole, aperture, opening, etc.). The first dividing tube assembly flange  8314  includes a plurality of the first flange outlet body perforations  8342 . According to various embodiments, each of the first flange outlet body perforations  8342  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the outlet dividing tube first end  8318 . After flowing through the first flange outlet body perforation  8342 , the exhaust gas enters the outlet dividing tube cavity  8336 . 
     The first flange outlet body perforation  8342  are disposed on a portion of the first dividing tube assembly flange  8314  that is opposite the outlet dividing tube cavity  8336 . In operation, the first flange outlet body perforations  8342  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the first dividing tube assembly flange  8314 , etc.) through the first dividing tube assembly flange  8314  and into the outlet dividing tube cavity  8336  without passing through the inlet dividing tube inlet aperture  8326 , the first flange inlet body perforations  8332 , or the dividing tube body bypass opening  8340 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the first flange outlet body perforation  8342  functions to heat the first dividing tube assembly flange  8314 , thereby mitigating impingement of the reductant on the first dividing tube assembly flange  8314 . The exhaust gas flowing through the first flange outlet body perforation  8342  may also be useful in redirecting the exhaust gas flowing within the outlet dividing tube cavity  8336  (e.g., towards the outlet dividing tube body axis  8338 , etc.), thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     A portion of the exhaust gas exits the outlet dividing tube cavity  8336  via an outlet dividing tube outlet aperture  8344  and flows towards the SCR catalyst members  216 . The exhaust gas flowing through the outlet dividing tube outlet aperture  8344  exits the outlet dividing tube cavity  8336  radially (e.g., along a tangent of the outlet dividing tube body  8312 , along a line that is parallel to and offset from a tangent of the outlet dividing tube body  8312 , etc.). This radial exit causes the exhaust gas to swirl downstream of the dividing tube assembly  8300 . The swirl imparted by the outlet dividing tube outlet aperture  8344  facilitates mixing of the exhaust gas and the reductant downstream of the dividing tube assembly  8300  and ensures shear downstream of the dividing tube assembly  8300  is relatively high, thereby mitigating impingement of the reductant and formation of deposits (e.g., on the mixing collector wall  226 , on the outer housing wall  232 , etc.). 
     Another portion of the exhaust gas exits the outlet dividing tube cavity  8336  via an outlet dividing tube perforation  8346  (e.g., hole, aperture, opening, etc.). The outlet dividing tube body  8312  includes a plurality of the outlet dividing tube perforations  8346 . According to various embodiments, each of the outlet dividing tube perforations  8346  is oriented towards one or more of the SCR catalyst members  216 . In operation, the outlet dividing tube perforations  8346  facilitate passage of the exhaust gas (e.g., exhaust gas within the outlet dividing tube cavity  8336 , etc.) through the outlet dividing tube body  8312  without passing through the outlet dividing tube outlet aperture  8344 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the outlet dividing tube perforations  8346  may be useful in redirecting the exhaust gas flowing within the outlet dividing tube cavity  8336  (e.g., towards the outlet dividing tube body axis  8338 , towards the outlet dividing tube outlet aperture  8344 , etc.), thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. In some embodiments, such as shown in  FIGS.  90 ,  91 ,  101 , and  102   , the outlet dividing tube body  8312  does not includes any of the outlet dividing tube perforations  8346 . 
     In some embodiments, such as shown in  FIGS.  88 - 92  and  102   , the mixing assembly  222  also includes a dividing tube collector  8348  (e.g., scoop, panel, etc.). The dividing tube collector  8348  is coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the mixing collector wall  226  and the dividing tube collector  8348  is substantially prohibited, etc.). In some embodiments, the dividing tube collector  8348  is coupled to the mixing collector wall  226  such that a portion of the dividing tube assembly  8300  is positioned within and/or adjacent to the dividing tube collector  8348 . 
     As shown in  FIGS.  84 - 86   , the decomposition chamber  108  also includes a perforated panel  8400  (e.g., wall, plate, etc.). The perforated panel  8400  extends between the SCR catalyst members  216  and the dividing tube  8300 . The perforated panel  8400  includes a plurality of the perforated panel perforations  8402  (e.g., holes, apertures, openings, etc.). According to various embodiments, each of the perforated panel perforations  8402  is aligned with one or more of the SCR catalyst members  216 . In operation, the perforated panel perforations  8402  facilitate passage of the exhaust gas (e.g., exhaust gas within the outlet dividing tube cavity  8336 , etc.) through the perforated panel  8400 . As a result, flow of the exhaust gas towards the SCR catalyst members  216  may be straightened. This may increase the UI of the exhaust gas. In some embodiments, such as shown in  FIG.  92   , the decomposition chamber  108  does not include the perforated panel  8400 . 
     In various embodiments, the dividing tube collector  8348  is coupled to the mixing collector wall  226  along the dividing tube coupler aperture  8310  (e.g., along a side of the dividing tube coupler aperture  8310 , etc.). In various embodiments, the dividing tube collector  8348  is not positioned within the dividing tube coupler aperture  8310 . 
     The dividing tube collector  8348  defines a dividing tube collector cavity  8350 . The exhaust gas flows out of the dividing tube collector cavity  8350  via dividing tube collector perforations  8352  (e.g., holes, openings, etc.) in the dividing tube collector  8348 . The dividing tube collector perforations  8352  may be arranged over the SCR catalyst members  216 . 
     The dividing tube assembly  8300  also includes a dividing tube assembly outer housing wall  8354 . The dividing tube assembly outer housing wall  8354  is contiguous with both the inlet dividing tube body  8308  and the outlet dividing tube body  8312  and extends between the inlet dividing tube body  8308  and the outlet dividing tube body  8312 . The dividing tube assembly outer housing wall  8354  is in confronting relation with the outer housing wall  232 . 
     In various embodiments, the dividing tube assembly outer housing wall  8354  is spaced apart from the outer housing wall  232  by a target spacing. In some embodiments, such as is shown in  FIG.  88   , the target spacing is 6 mm. In other embodiments, such as is shown in  FIG.  89   , the target spacing in 12 mm. Where the dividing tube assembly outer housing wall  8354  is spaced apart from the outer housing wall  232 , a portion of the exhaust gas flows between the outer housing wall  232  and the inlet dividing tube body  8308 , along the dividing tube assembly outer housing wall  8354 , between the outer housing wall  232  and the outlet dividing tube body  8312 , and into the dividing tube collector cavity  8350 . Therefore, exhaust gas may flow into the dividing tube collector cavity  8350  either from the outlet dividing tube outlet aperture  8344  or after flowing around the divider tube assembly  8300 . As a result, the backpressure of the decomposition chamber  108  may be decreased. The exhaust gas flowing around the divider tube assembly  8300  functions to heat the divider tube assembly  8300 , thereby mitigating impingement of the reductant on the divider tube assembly  8300 . Further, the exhaust gas flowing around the divider tube assembly  8300  causes the exhaust gas within the dividing tube collector cavity  8350  to be propelled out of the dividing tube collector cavity  8350 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     XXX. Example Decomposition Chamber Having a Twenty-Seventh Example Mixing Assembly 
       FIG.  103    illustrates the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  10200 . The dividing tube  10200  includes a dividing tube body  10202  (e.g., frame, shell, etc.) and a dividing tube flange  10203  (e.g., wall, divider, etc.). The dividing tube body  10202  is generally cylindrical. In some embodiments, the dividing tube body  10202  is tapered. 
     In various embodiments, the dividing tube body  10202  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  10202  and the mixing assembly wall  230  is substantially prohibited, etc.), the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  10202  and the mixing collector wall  226  is substantially prohibited, etc.), and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  10202  and the outer housing wall  232  is substantially prohibited, etc.). 
     The dividing tube  10200  separates a concentration cavity  10204  from a transfer cavity  10206 . The concentration cavity  10204  is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  10202 , and the dividing tube flange  10203 . The transfer cavity  10206  is defined between the mixing collector wall  226 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  10202 , the dividing tube flange  10203 , and a mixing assembly flow aperture  10208  (e.g., hole, opening, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  10208  functions as the mixing collector wall aperture  227 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the concentration cavity  10204  and enters the dividing tube  10200  via a dividing tube inlet aperture  10209  (e.g., hole, opening, etc.). The dividing tube body  10202  includes a first end  10210  and a second end  10211  opposite the first end  10210 . The first end  10210  interfaces with and/or is coupled to the dividing tube flange  10203 . The second end  10211  interfaces with and/or is coupled to the dividing tube flange  10203 . The dividing tube inlet aperture  10209  is located proximate the second end  10211 . The first end  10210  may include tabs that are configured to be received within slots within the dividing tube flange  10203  to facilitate coupling of the dividing tube  10200  to the dividing tube flange  10203 . The second end  10211  may include tabs that are configured to be received within slots within the mixing assembly wall  230  to facilitate coupling of the dividing tube  10200  to the mixing assembly wall  230 . 
     The dividing tube body  10202  also includes a first duct  10212  (e.g., cowl, hood, etc.). The first duct  10212  is contiguous with, and extends over, the dividing tube inlet aperture  10209 . The first duct  10212  extends towards the concentration cavity  10204  such that the first duct  10212  functions to direct the exhaust gas into the dividing tube inlet aperture  10209 . 
     After flowing through the dividing tube inlet aperture  10209 , the exhaust gas enters a dividing tube cavity  10214 . At least a portion of the dividing tube inlet aperture  10209  and at least a portion of the first duct  10212  are located proximate the outer housing wall  232 . As a result, the exhaust gas enters the dividing tube cavity  10214  radially (e.g., along a tangent of the dividing tube body  10202 , along a line that is parallel to and offset from a tangent of the dividing tube body  10202 , etc.) after flowing through the dividing tube inlet aperture  10209 . This radial entry causes the exhaust gas to swirl within the dividing tube cavity  10214 . The swirl imparted by the dividing tube inlet aperture  10209  and the first duct  10212  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  10214  and ensures shear on the dividing tube body  10202  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  10202 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  10200  is positioned such that the injector coupler  234  is received in an injector mount receiver  10216  in the second end  10211 . As a result, the injection region  314  is located within the dividing tube cavity  10214 . 
     The exhaust gas exits the dividing tube cavity  10214  via a dividing tube outlet aperture  10218  and flows into the transfer cavity  10206 . From the transfer cavity  10206 , the exhaust gas flows through the mixing assembly flow aperture  10208  and towards the SCR catalyst member  216 . In various embodiments, the mixing assembly flow aperture  10208  is substantially centered relative to the SCR catalyst member  216 . For example, the mixing assembly flow aperture  10208  may be located on the mixing collector wall  226  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the mixing assembly flow aperture  10208  may increase the FDI and the UI of the exhaust gas. 
     The dividing tube outlet aperture  10218  is positioned proximate the first end  10210 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  10209  to the dividing tube outlet aperture  10218  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  10218  is first swirled by the dividing tube body  10202 . Furthermore, due to the dividing tube inlet aperture  10209  being positioned proximate the second end  10211  and the dividing tube outlet aperture  10218  being positioned proximate the first end  10210 , a distance between the dividing tube inlet aperture  10209  and the dividing tube outlet aperture  10218  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  10214  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The dividing tube body  10202  also includes a second duct  10220  (e.g., cowl, hood, etc.). The second duct  10220  is contiguous with, and extends over, the dividing tube outlet aperture  10218 . The second duct  10220  extends towards the transfer cavity  10206  such that the second duct  10220  functions to direct the exhaust gas towards the mixing assembly flow aperture  10208 . In some embodiments, the second duct  10220  extends over the mixing assembly flow aperture  10208 . The exhaust gas exits the dividing tube cavity  10214  radially after flowing through the dividing tube outlet aperture  10218 . This radial exit propels the exhaust gas into the mixing assembly flow aperture  10208 , thereby minimizing backpressure of the decomposition chamber  108 . 
     In various embodiments, the mixing collector wall  226  also includes a dividing tube coupling aperture  10222  (e.g., hole, opening, etc.). The dividing tube coupling aperture  10222  is configured to receive a portion of the dividing tube body  10202 . The dividing tube body  10202  is coupled to the mixing collector wall  226  around the dividing tube coupling aperture  10222  (e.g., such that flow of the exhaust gas between the dividing tube body  10202  and the mixing collector wall  226  is substantially prohibited, etc.). As a result, a plane along which the mixing collector wall  226  is disposed bisects the dividing tube cavity  10214  such that a first portion of the dividing tube cavity  10214  is located on one side of the mixing collector wall  226  and a second portion of the dividing tube cavity  10214  is located on another side of the mixing collector wall  226 . As a result of this arrangement, a diameter of the dividing tube  10200  can be increased without increasing a distance between the mixing collector wall  226  and the outer housing wall  232 , thereby enabling a space claim of the decomposition chamber  108  to be minimized. By increasing the diameter of the dividing tube  10200 , the UI of the exhaust gas can be increased. 
     In various embodiments, the dividing tube body  10202  includes a shield  10226  (e.g., wall, projection, etc.). The shield  10226  is contiguous with the dividing tube inlet aperture  10209  and extends into the dividing tube cavity  10214  and towards the transfer cavity  10206  (e.g., the shield  10226  is bent inward relative to the dividing tube body  10202 , etc.). The shield  10226  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  10214  via the dividing tube inlet aperture  10209 . 
     In various embodiments, the dividing tube body  10202  also includes a plurality of dividing tube body perforations (e.g., apertures, holes, etc.). The dividing tube body perforations are disposed on an upstream surface of the dividing tube body  10202  (e.g., adjacent the concentration cavity  10204 , etc.). In some embodiments, at least some of the dividing tube body perforations are aligned with the dividing tube outlet aperture  10218 . In operation, the dividing tube body perforations facilitate passage of the exhaust gas through the dividing tube body  10202  and into the dividing tube cavity  10214  without passing through the dividing tube inlet aperture  10209 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube body perforations functions to heat the dividing tube body  10202 , thereby mitigating impingement of the reductant on the dividing tube body  10202 . By aligning at least some of the dividing tube body perforations with the dividing tube outlet aperture  10218 , the exhaust gas flowing within the dividing tube cavity  10214  may be propelled out of the dividing tube outlet aperture  10218 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the dividing tube flange  10203  includes a plurality of dividing tube flange tube perforations (e.g., apertures, holes, etc.). The dividing tube flange tube perforations are disposed on a portion of the dividing tube flange  10203  that is opposite the dividing tube cavity  10214  (e.g., are located opposite the first end  10210 , etc.). In operation, the dividing tube flange tube perforations facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  10203 , etc.) through the dividing tube flange  10203  and into the dividing tube cavity  10214  without passing through the dividing tube inlet aperture  10209  or the dividing tube body perforations. As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange tube perforations functions to heat the first end  10210 , thereby mitigating impingement of the reductant on the first end  10210 . The exhaust gas flowing through the dividing tube flange tube perforations may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  10214  towards the dividing tube outlet aperture  10218 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the dividing tube flange  10203  includes a plurality of dividing tube flange transfer perforations  10234  (e.g., apertures, holes, etc.). The dividing tube flange transfer perforations  10234  are disposed on a portion of the dividing tube flange  10203  that is not opposite the dividing tube cavity  10214  (e.g., are located downstream of the dividing tube body  10202 , etc.). Instead, the dividing tube flange transfer perforations  10234  are disposed on a portion of the dividing tube flange  10203  that is opposite the transfer cavity  10206  (e.g., that is opposite the mixing assembly flow aperture  10208 , etc.). In operation, the dividing tube flange transfer perforations  10234  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  10203 , etc.) through the dividing tube flange  10203  and into the transfer cavity  10206  without passing through the dividing tube body  10202 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange transfer perforations  10234  functions to heat the dividing tube flange  10203 , thereby mitigating impingement of the reductant on the dividing tube flange  10203  (e.g., the portion of the dividing tube flange  10203  that is downstream of the dividing tube outlet aperture  10218 , etc.). The exhaust gas flowing through the dividing tube flange transfer perforations  10234  may also be useful in redirecting the exhaust gas flowing within the transfer cavity  10206  towards the mixing assembly flow aperture  10208 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The decomposition chamber  108  also includes a channel wall  10236  (e.g., vane, wall, partition, divider, etc.) coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the channel wall  10236  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the channel wall  10236  and the outer housing wall  232  is substantially prohibited, etc.), and the dividing tube body  10202  (e.g., such that flow of the exhaust gas between the dividing tube body  10202  and the outer housing wall  232  is substantially prohibited, etc.). The channel wall  10236  extends along at least a portion of the mixing assembly flow aperture  10208 . In various embodiments, the channel wall  10236  is coupled to the dividing tube body  10202  such that the channel wall  10236  is in confronting relation with the dividing tube outlet aperture  10218  and/or the second duct  10220 . 
     XXXI. Example Decomposition Chamber Having a Twenty-Eighth Example Mixing Assembly 
       FIGS.  104 - 106    illustrate the decomposition chamber  108  and the mixing assembly  222  according to another example embodiment. The decomposition chamber  108  includes the distribution cap  300  as described herein. The decomposition chamber  108  also includes a dividing tube  10300 . The dividing tube  10300  includes a dividing tube body  10302  (e.g., frame, shell, etc.) and a dividing tube flange  10303  (e.g., wall, divider, etc.). The dividing tube body  10302  is generally cylindrical. In some embodiments, the dividing tube body  10302  is tapered. 
     In various embodiments, the dividing tube body  10302  is coupled to the mixing assembly wall  230  (e.g., such that flow of the exhaust gas between the dividing tube body  10302  and the mixing assembly wall  230  is substantially prohibited, etc.), the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the dividing tube body  10302  and the mixing collector wall  226  is substantially prohibited, etc.), and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the dividing tube body  10302  and the outer housing wall  232  is substantially prohibited, etc.). 
     The dividing tube  10300  separates a concentration cavity  10304  from a transfer cavity  10306 . The concentration cavity  10304  is defined between the mixing collector wall  226 , the distribution cap wall  304 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  10302 , and the dividing tube flange  10303 . The transfer cavity  10306  is defined between the mixing collector wall  226 , the outer housing wall  232 , the mixing assembly wall  230 , the dividing tube body  10302 , the dividing tube flange  10303 , and a mixing assembly flow aperture  10308  (e.g., hole, opening, etc.) in the mixing collector wall  226 . The mixing assembly flow aperture  10308  functions as the mixing collector wall aperture  227 . 
     After flowing out of the distribution cap  300  (e.g., via the distribution cap aperture  302 ), the exhaust gas enters the concentration cavity  10304  and enters the dividing tube  10300  via a dividing tube inlet aperture  10309  (e.g., hole, opening, etc.). The dividing tube body  10302  includes a first end  10310  and a second end  10311  opposite the first end  10310 . The first end  10310  interfaces with and/or is coupled to the dividing tube flange  10303 . The dividing tube inlet aperture  10309  is located proximate the second end  10311 . The first end  10310  may include tabs that are configured to be received within slots within the dividing tube flange  10303  to facilitate coupling of the dividing tube  10300  to the dividing tube flange  10303 . The second end  10311  may include tabs that are configured to be received within slots within the mixing assembly wall  230  to facilitate coupling of the dividing tube  10300  to the mixing assembly wall  230 . 
     Exhaust gas may flow between the dividing tube flange  10303  and the mixing assembly wall  230  because the dividing tube flange  10303  is not coupled to the mixing assembly wall  230 . Any exhaust gas that flows between the dividing tube flange  10303  and the mixing assembly wall  230  bypasses the dividing tube  10300 . By bypassing the dividing tube  10300 , a backpressure of the decomposition chamber  108  may be decreased. 
     The dividing tube body  10302  also includes a first duct  10312  (e.g., cowl, hood, etc.). The first duct  10312  is contiguous with, and extends over, the dividing tube inlet aperture  10309 . The first duct  10312  extends towards the concentration cavity  10304  such that the first duct  10312  functions to direct the exhaust gas into the dividing tube inlet aperture  10309 . 
     After flowing through the dividing tube inlet aperture  10309 , the exhaust gas enters a dividing tube cavity  10314 . At least a portion of the dividing tube inlet aperture  10309  and at least a portion of the first duct  10312  are located proximate the outer housing wall  232 . As a result, the exhaust gas enters the dividing tube cavity  10314  radially (e.g., along a tangent of the dividing tube body  10302 , along a line that is parallel to and offset from a tangent of the dividing tube body  10302 , etc.) after flowing through the dividing tube inlet aperture  10309 . This radial entry causes the exhaust gas to swirl within the dividing tube cavity  10314 . The swirl imparted by the dividing tube inlet aperture  10309  and the first duct  10312  facilitates mixing of the exhaust gas and the reductant within the dividing tube cavity  10314  and ensures shear on the dividing tube body  10302  is relatively high, thereby mitigating impingement of the reductant on the dividing tube body  10302 . 
     The mixing assembly wall  230  includes the injector coupler  234 . The dividing tube  10300  is positioned such that the injector coupler  234  is received in an injector mount receiver  10316  in the second end  10311 . As a result, the injection region  314  is located within the dividing tube cavity  10314 . 
     The exhaust gas exits the dividing tube cavity  10314  via a dividing tube outlet aperture  10318  and flows into the transfer cavity  10306 . From the transfer cavity  10306 , the exhaust gas flows through the mixing assembly flow aperture  10308  and towards the SCR catalyst member  216 . In various embodiments, the mixing assembly flow aperture  10308  is substantially centered relative to the SCR catalyst member  216 . For example, the mixing assembly flow aperture  10308  may be located on the mixing collector wall  226  so as to have a center (e.g., center point, etc.) that is centered relative to centers of each SCR catalyst member  216 . In this way, the mixing assembly flow aperture  10308  may increase the FDI and the UI of the exhaust gas. 
     A shape and size of the mixing assembly flow aperture  10308  may be selected so that the decomposition chamber  108  is tailored for a target application. For example, as shown in  FIGS.  104  and  105   , the mixing assembly flow aperture  10308  may be generally rectangular. However, in other applications, such as is shown in  FIG.  106   , the mixing assembly flow aperture  10308  may include a lobed shape to increase a size of the mixing assembly flow aperture  10308  which may increase the desirability of the decomposition chamber  108 . 
     The dividing tube outlet aperture  10318  is positioned proximate the first end  10310 . As a result, straight flow (e.g., flow without swirling, etc.) of the exhaust gas from the dividing tube inlet aperture  10309  to the dividing tube outlet aperture  10318  is substantially prevented, thereby ensuring that substantially all of the exhaust gas that exits the dividing tube outlet aperture  10318  is first swirled by the dividing tube body  10302 . Furthermore, due to the dividing tube inlet aperture  10309  being positioned proximate the second end  10311  and the dividing tube outlet aperture  10318  being positioned proximate the first end  10310 , a distance between the dividing tube inlet aperture  10309  and the dividing tube outlet aperture  10318  may be maximized, thereby increasing the amount of time that the exhaust gas is retained within the dividing tube cavity  10314  which correspondingly increases mixing of the reductant in the exhaust gas and the UI. 
     The dividing tube body  10302  also includes a second duct  10320  (e.g., cowl, hood, etc.). The second duct  10320  is contiguous with, and extends over, the dividing tube outlet aperture  10318 . The second duct  10320  extends towards the transfer cavity  10306  such that the second duct  10320  functions to direct the exhaust gas towards the mixing assembly flow aperture  10308 . In some embodiments, the second duct  10320  extends over the mixing assembly flow aperture  10308 . The exhaust gas exits the dividing tube cavity  10314  radially after flowing through the dividing tube outlet aperture  10318 . This radial exit propels the exhaust gas into the mixing assembly flow aperture  10308 , thereby minimizing backpressure of the decomposition chamber  108 . 
     In various embodiments, the mixing collector wall  226  also includes a dividing tube coupling aperture  10322  (e.g., hole, opening, etc.). The dividing tube coupling aperture  10322  is configured to receive a portion of the dividing tube body  10302 . The dividing tube body  10302  is coupled to the mixing collector wall  226  around the dividing tube coupling aperture  10322  (e.g., such that flow of the exhaust gas between the dividing tube body  10302  and the mixing collector wall  226  is substantially prohibited, etc.). As a result, a plane along which the mixing collector wall  226  is disposed bisects the dividing tube cavity  10314  such that a first portion of the dividing tube cavity  10314  is located on one side of the mixing collector wall  226  and a second portion of the dividing tube cavity  10314  is located on another side of the mixing collector wall  226 . As a result of this arrangement, a diameter of the dividing tube  10300  can be increased without increasing a distance between the mixing collector wall  226  and the outer housing wall  232 , thereby enabling a space claim of the decomposition chamber  108  to be minimized. By increasing the diameter of the dividing tube  10300 , the UI of the exhaust gas can be increased. 
     In various embodiments, the dividing tube body  10302  includes a shield  10326  (e.g., wall, projection, etc.). The shield  10326  is contiguous with the dividing tube inlet aperture  10309  and extends into the dividing tube cavity  10314  and towards the transfer cavity  10306  (e.g., the shield  10326  is bent inward relative to the dividing tube body  10302 , etc.). The shield  10326  functions to mitigate non-radial flow of the exhaust gas into the dividing tube cavity  10314  via the dividing tube inlet aperture  10309 . 
     In various embodiments, the dividing tube body  10302  also includes a plurality of dividing tube body perforations (e.g., apertures, holes, etc.). The dividing tube body perforations are disposed on an upstream surface of the dividing tube body  10302  (e.g., adjacent the concentration cavity  10304 , etc.). In some embodiments, at least some of the dividing tube body perforations are aligned with the dividing tube outlet aperture  10318 . In operation, the dividing tube body perforations facilitate passage of the exhaust gas through the dividing tube body  10302  and into the dividing tube cavity  10314  without passing through the dividing tube inlet aperture  10309 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube body perforations functions to heat the dividing tube body  10302 , thereby mitigating impingement of the reductant on the dividing tube body  10302 . By aligning at least some of the dividing tube body perforations with the dividing tube outlet aperture  10318 , the exhaust gas flowing within the dividing tube cavity  10314  may be propelled out of the dividing tube outlet aperture  10318 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the dividing tube flange  10303  includes a plurality of dividing tube flange tube perforations (e.g., apertures, holes, etc.). The dividing tube flange tube perforations are disposed on a portion of the dividing tube flange  10303  that is opposite the dividing tube cavity  10314  (e.g., are located opposite the first end  10310 , etc.). In operation, the dividing tube flange tube perforations facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  10303 , etc.) through the dividing tube flange  10303  and into the dividing tube cavity  10314  without passing through the dividing tube inlet aperture  10309  or the dividing tube body perforations. As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange tube perforations functions to heat the first end  10310 , thereby mitigating impingement of the reductant on the first end  10310 . The exhaust gas flowing through the dividing tube flange tube perforations may also be useful in redirecting the exhaust gas flowing within the dividing tube cavity  10314  towards the dividing tube outlet aperture  10318 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, the dividing tube flange  10303  includes a plurality of dividing tube flange transfer perforations (e.g., apertures, holes, etc.). The dividing tube flange transfer perforations are disposed on a portion of the dividing tube flange  10303  that is not opposite the dividing tube cavity  10314  (e.g., are located downstream of the dividing tube body  10302 , etc.). Instead, the dividing tube flange transfer perforations are disposed on a portion of the dividing tube flange  10303  that is opposite the transfer cavity  10306  (e.g., that is opposite the mixing assembly flow aperture  10308 , etc.). In operation, the dividing tube flange transfer perforations facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  10303 , etc.) through the dividing tube flange  10303  and into the transfer cavity  10306  without passing through the dividing tube body  10302 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange transfer perforations functions to heat the dividing tube flange  10303 , thereby mitigating impingement of the reductant on the dividing tube flange  10303  (e.g., the portion of the dividing tube flange  10303  that is downstream of the dividing tube outlet aperture  10318 , etc.). The exhaust gas flowing through the dividing tube flange transfer perforations may also be useful in redirecting the exhaust gas flowing within the transfer cavity  10306  towards the mixing assembly flow aperture  10308 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     The decomposition chamber  108  also includes a channel wall  10336  (e.g., vane, wall, partition, divider, etc.) coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the channel wall  10336  and the mixing collector wall  226  is substantially prohibited, etc.), the outer housing wall  232  (e.g., such that flow of the exhaust gas between the channel wall  10336  and the outer housing wall  232  is substantially prohibited, etc.), and the dividing tube body  10302  (e.g., such that flow of the exhaust gas between the dividing tube body  10302  and the outer housing wall  232  is substantially prohibited, etc.). The channel wall  10336  extends along at least a portion of the mixing assembly flow aperture  10308 . In various embodiments, the channel wall  10336  is coupled to the dividing tube body  10302  such that the channel wall  10336  is in confronting relation with the dividing tube outlet aperture  10318  and/or the second duct  10320 . 
     The decomposition chamber  108  also includes a flow guide  10338  (e.g., vane, wall, partition, divider, etc.) coupled to the mixing collector wall  226  (e.g., such that flow of the exhaust gas between the flow guide  10338  and the mixing collector wall  226  is substantially prohibited, etc.) and the outer housing wall  232  (e.g., such that flow of the exhaust gas between the flow guide  10338  and the outer housing wall  232  is substantially prohibited, etc.). After flowing past the dividing tube flange  10303  and/or flowing past the channel wall  10336 , the exhaust gas interfaces with the flow guide  10338 . For example, the exhaust gas may flow between the channel wall  10336  and the flow guide  10338 . The channel wall  10336  and the flow guide  10338  cooperate to reduce turbulence of the exhaust gas, reduce backpressure of the decomposition chamber  108 , and to increase the FDI and the UI of the exhaust gas. 
     Additionally, the reductant (e.g., via the injector  120 , via the dosing module  112 , etc.) may enter the dividing tube body  10302  via a second dividing tube assembly flange aperture  10400  (e.g., hole, opening, etc.). The second dividing tube assembly flange aperture  10400  is at least partially circumscribed by (e.g., encircled, bordered by, surrounded by, etc.) the second end  10311 . After flowing through the second dividing tube assembly flange aperture  10400 , the reductant enters the dividing tube cavity  10314 . 
     In various embodiments, such as is shown in  FIGS.  107 ,  119 , and  124   , the dividing tube flange  10303  includes a first dividing tube flange segment  10600  and a second dividing tube flange segment  10602 . Each of the first end  10310 , the first dividing tube flange segment  10600 , and the second dividing tube flange segment  10602  are separated from the mixing assembly wall  230 . As a result, the exhaust gas flows between the first end  10310  and the mixing assembly wall  230 , between the first dividing tube flange segment  10600  and the mixing assembly wall  230 , and between the second dividing tube flange segment  10602  and the mixing assembly wall  230 . Additionally, the second dividing tube flange segment  10602  is separated from the first dividing tube flange segment  10600 . As a result, the exhaust gas may flow between the first dividing tube flange segment  10600  and the second dividing tube flange segment  10602 . 
     In various embodiments, such as is shown in  FIGS.  108 A and  108 B , the dividing tube  10300  is separated from the outer housing wall  232  by a gap. The gap may be, for example, 4 mm. In various embodiments, such as is shown in  FIGS.  109 - 141   , the second end  10311  may be tapered (e.g., frustoconical, etc.). This may mitigate undesirable recirculation of the exhaust gas. Only a portion (e.g., downstream portion, etc.) of the second end  10311  is tapered in some embodiments, such as is shown in  FIG.  109   . In some embodiments, such as is shown in  FIGS.  112 - 120 ,  122 - 128 ,  131 ,  132 , and  135 - 141   , the second end  10311  may include a deflecting lip  11200 . The deflecting lip  11200  may cause the exhaust gas flowing into the dividing tube body  10302  to swirl within the dividing tube body  10302  away from the second end  10311 . In various embodiments, such as is shown in  FIGS.  116  and  117   , an annular flange (e.g., ring, rib, etc.) is included around the second dividing tube flange aperture. In various embodiments, such as is shown in  FIG.  118   , a portion (e.g., upstream portion, etc.) of the second end  10311  may be tapered. In various embodiments, such as is shown in  FIG.  119   , a portion of the dividing tube  10300  proximate the outlet may be angled away from the first end  10310 . In various embodiments, such as is shown in  FIGS.  120 ,  121 ,  128 - 131 , and  140    a roof  12000  may be included and attached to the dividing tube  10300 . 
     In various embodiments, such as is shown in  FIG.  126   , the dividing tube flange  10303  includes a plurality of dividing tube flange transfer perforations  12600  (e.g., apertures, holes, etc.). The dividing tube flange transfer perforations  12600  are disposed on a portion of the dividing tube flange  10303  that is not opposite the dividing tube cavity  10314  (e.g., are located downstream of the dividing tube body  10302 , etc.). In operation, the dividing tube flange transfer perforations  12600  facilitate passage of the exhaust gas (e.g., exhaust gas that has flowed between the mixing assembly wall  230  and the dividing tube flange  10303 , etc.) through the dividing tube flange  10303  without passing through the dividing tube body  10202 . As a result, the backpressure of the decomposition chamber  108  may be decreased. Furthermore, the exhaust gas flowing through the dividing tube flange transfer perforations  12600  functions to heat the dividing tube flange  10303 , thereby mitigating impingement of the reductant on the dividing tube flange  10303 . The exhaust gas flowing through the dividing tube flange transfer perforations  12600  may also be useful in redirecting the exhaust gas flowing towards the mixing assembly flow aperture  10308 , thereby decreasing the backpressure of the decomposition chamber  108  and increasing the UI of the exhaust gas. 
     In various embodiments, such as is shown in  FIGS.  115  and  116   , the dividing tube body  10302  includes a flared portion  11500 . The flared portion  11500  circumscribes the second dividing tube assembly flange aperture  10400  and extends away from the second flange. In other embodiments, such as is shown in  FIGS.  104 ,  110 ,  125 ,  131 ,  132 ,  134 , and  139    the dividing tube body  10302  does not include the flared portion  11500 . 
     XXXII. Construction of Example Embodiments 
     While this specification contains many specific implementation details, these should not be construed as limitations on the scope of what may be claimed but rather as descriptions of features specific to particular implementations. Certain features described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can, in some cases, be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination. 
     As utilized herein, the terms “substantially,” “generally,” and similar terms are intended to have a broad meaning in harmony with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. It should be understood by those of skill in the art who review this disclosure that these terms are intended to allow a description of certain features described and claimed without restricting the scope of these features to the precise numerical ranges provided. Accordingly, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the invention as recited in the appended claims. 
     The term “coupled” and the like, as used herein, mean the joining of two components directly or indirectly to one another. Such joining may be stationary (e.g., permanent) or moveable (e.g., removable or releasable). Such joining may be achieved with the two components or the two components and any additional intermediate components being integrally formed as a single unitary body with one another, with the two components, or with the two components and any additional intermediate components being attached to one another. 
     The terms “fluidly coupled to” and the like, as used herein, mean the two components or objects have a pathway formed between the two components or objects in which a fluid, such as air, exhaust gas, liquid reductant, gaseous reductant, aqueous reductant, gaseous ammonia, etc., may flow, either with or without intervening components or objects. Examples of fluid couplings or configurations for enabling fluid communication may include piping, channels, or any other suitable components for enabling the flow of a fluid from one component or object to another. 
     It is important to note that the construction and arrangement of the system shown in the various example implementations is illustrative only and not restrictive in character. All changes and modifications that come within the spirit and/or scope of the described implementations are desired to be protected. It should be understood that some features may not be necessary, and implementations lacking the various features may be contemplated as within the scope of the application, the scope being defined by the claims that follow. When the language “a portion” is used, the item can include a portion and/or the entire item unless specifically stated to the contrary. 
     Also, the term “or” is used in its inclusive sense (and not in its exclusive sense) so that when used, for example, to connect a list of elements, the term “or” means one, some, or all of the elements in the list. Conjunctive language such as the phrase “at least one of X, Y, and Z,” unless specifically stated otherwise, is otherwise understood with the context as used in general to convey that an item, term, etc. may be either X, Y, Z, X and Y, X and Z, Y and Z, or X, Y, and Z (i.e., any combination of X, Y, and Z). Thus, such conjunctive language is not generally intended to imply that certain embodiments require at least one of X, at least one of Y, and at least one of Z to each be present, unless otherwise indicated. 
     Additionally, the use of ranges of values (e.g., W to P, etc.) herein are inclusive of their maximum values and minimum values (e.g., W to P includes W and includes P, etc.), unless otherwise indicated. Furthermore, a range of values (e.g., W to P, etc.) does not necessarily require the inclusion of intermediate values within the range of values (e.g., W to P can include only W and P, etc.), unless otherwise indicated.