A dosing and mixing arrangement for an exhaust system comprising; a housing including a main housing body that defines a central housing axis, the main housing body having a length that extends along the central housing axis between first and second opposite ends of the main housing body, the housing also including an inlet adjacent the first end of the main housing body and an outlet adjacent the second end of the main housing body; a perforated tube forming the outlet of the housing, the perforated tube defining a tube axis aligned at an angle relative to the central housing axis; the main housing body defining an interior volume that extends between an exhaust treatment substrate disposed in the housing and the perforated tube, the interior volume defining a transverse cross-sectional area that is transverse relative to the central housing axis; a baffle plate positioned within the interior volume between the perforated tube and the inlet, the baffle plate having a main plate body having an upstream side that faces toward the inlet and a downstream side that faces toward the perforated tube, the main plate body having a connected edge that is connected to an interior of the main housing body and a free edge that extends across the interior volume of the main housing body, the main plate body being sized and shaped to coincide with only a portion of the transverse cross-sectional area of the interior volume such that an open flow area is defined between the free edge and the interior of the main housing body; and wherein a first portion of exhaust gas flow flowing through the housing is directed though the open flow area and then in a first rotational direction (d) around the perforated tube, characterized in the main plate body defining a plurality of flow-through openings that extend through the main plate body between the upstream and downstream sides (56, 58) of the main plate body, the baffle plate also including a plurality of louvers positioned adjacent to the flow-through openings at the downstream side of the main plate body, and wherein a second portion of the exhaust gas flow passes through the flow-through openings and is deflected in the first rotation direction (d) about the perforated tube by the louvers, a housing including a main housing body that defines a central housing axis, the main housing body having a length that extends along the central housing axis between first and second opposite ends of the main housing body, the housing also including an inlet adjacent the first end of the main housing body and an outlet adjacent the second end of the main housing body; a perforated tube forming the outlet of the housing, the perforated tube defining a tube axis aligned at an angle relative to the central housing axis; the main housing body defining an interior volume that extends between an exhaust treatment substrate disposed in the housing and the perforated tube, the interior volume defining a transverse cross-sectional area that is transverse relative to the central housing axis; a baffle plate positioned within the interior volume between the perforated tube and the inlet, the baffle plate having a main plate body having an upstream side that faces toward the inlet and a downstream side that faces toward the perforated tube, the main plate body having a connected edge that is connected to an interior of the main housing body and a free edge that extends across the interior volume of the main housing body, the main plate body being sized and shaped to coincide with only a portion of the transverse cross-sectional area of the interior volume such that an open flow area is defined between the free edge and the interior of the main housing body; and wherein a first portion of exhaust gas flow flowing through the housing is directed though the open flow area and then in a first rotational direction (d) around the perforated tube, characterized in the main plate body defining a plurality of flow-through openings that extend through the main plate body between the upstream and downstream sides (56, 58) of the main plate body, the baffle plate also including a plurality of louvers positioned adjacent to the flow-through openings at the downstream side of the main plate body, and wherein a second portion of the exhaust gas flow passes through the flow-through openings and is deflected in the first rotation direction (d) about the perforated tube by the louvers,