A flow splitter (200, 400, 500) comprising: an inlet conduit (202, 502) including an inlet end and a junction end, the inlet conduit disposed along a main flow axis extending between the inlet end and the junction end, the inlet end defining an inlet opening, the junction end defining first and second junction openings (209, 211), the first junction opening being disposed in spaced relationship to the second junction opening, the inlet conduit (202, 502) defining an inlet passage extending between the inlet opening and the first and second junction openings (209, 211); a first outlet conduit (204, 504) in fluid communication with the first junction opening of the inlet conduit (202, 502), the first outlet conduit (204, 504) including a discharge end defining a first discharge opening; a second outlet conduit in fluid communication with the second junction opening of the inlet conduit, the second outlet conduit (206, 506) including a discharge end defining a second discharge opening; and a junction portion disposed at the junction end of the inlet conduit (202, 502), the junction portion disposed between the first junction opening and the second junction opening; wherein the inlet conduit (202, 502) includes a contoured portion that defines a flow restriction in the inlet passage adjacent the junction portion, the contoured portion defining first and second guide channels (218, 220), the flow restriction disposed laterally between the first and second guide channels (218, 220) along a transverse axis (60, 85) substantially perpendicular to the main flow axis, the first and second guide channels (218, 220) each having a cross-sectional area greater than the cross-sectional area of the flow restriction, the flow restriction having a maximum height (H 1) along a height axis, the height axis being perpendicular to both the main flow axis and the transverse axis, and the first and second guide channels (218, 220) each having a maximum height (H 2, H 3) along the height axis which is larger than the maximum height (H 1) of the flow restriction. an inlet conduit (202, 502) including an inlet end and a junction end, the inlet conduit disposed along a main flow axis extending between the inlet end and the junction end, the inlet end defining an inlet opening, the junction end defining first and second junction openings (209, 211), the first junction opening being disposed in spaced relationship to the second junction opening, the inlet conduit (202, 502) defining an inlet passage extending between the inlet opening and the first and second junction openings (209, 211); a first outlet conduit (204, 504) in fluid communication with the first junction opening of the inlet conduit (202, 502), the first outlet conduit (204, 504) including a discharge end defining a first discharge opening; a second outlet conduit in fluid communication with the second junction opening of the inlet conduit, the second outlet conduit (206, 506) including a discharge end defining a second discharge opening; and a junction portion disposed at the junction end of the inlet conduit (202, 502), the junction portion disposed between the first junction opening and the second junction opening; wherein the inlet conduit (202, 502) includes a contoured portion that defines a flow restriction in the inlet passage adjacent the junction portion, the contoured portion defining first and second guide channels (218, 220), the flow restriction disposed laterally between the first and second guide channels (218, 220) along a transverse axis (60, 85) substantially perpendicular to the main flow axis, the first and second guide channels (218, 220) each having a cross-sectional area greater than the cross-sectional area of the flow restriction, the flow restriction having a maximum height (H 1) along a height axis, the height axis being perpendicular to both the main flow axis and the transverse axis, and the first and second guide channels (218, 220) each having a maximum height (H 2, H 3) along the height axis which is larger than the maximum height (H 1) of the flow restriction.