Abstract: An aftertreatment system includes an inlet body, a cartridge, and an outlet body. The inlet body includes an inlet body wall and an inlet engagement member. The inlet engagement member includes an inlet engagement member wall and an inlet coupling flange. The inlet coupling flange extends in a downstream direction from the inlet engagement member wall. The cartridge includes a cartridge wall and an adaptor that extends away from the cartridge wall. The outlet body includes an outlet body wall and an outlet engagement member. The outlet engagement member includes an outlet engagement member wall and an outlet coupling flange. The outlet coupling flange extends in an upstream direction from the outlet engagement member wall and towards the adaptor such that the adaptor is disposed between the inlet coupling flange and the outlet coupling flange.

Abstract: 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.