Abstract: A system includes a cylindrical portion coupled to a conically-shaped outlet portion of a three-way catalyst assembly. The cylindrical portion is coupled to the conically shaped outlet portion along a fluid flow path exiting the conically-shaped outlet portion. The cylindrical portion is coupled to a narrower end of the conically-shaped outlet portion. At least one oxygen sensor connection is disposed on the cylindrical portion to enable an oxygen sensor coupled to the at least one oxygen sensor connection to be disposed perpendicular to a longitudinal axis of the cylindrical portion.

Abstract: A system includes a catalyst assembly configured to mount along an exhaust flow path of a reciprocating combustion engine. The catalyst assembly includes a housing having an inlet, an outlet, and a flow path between the inlet and the outlet. The catalyst assembly also includes or more catalyst elements disposed in the housing along the flow path. The catalyst assembly further includes an emissions sampling probe integrated within the housing along the flow path.