Turbocharger turbine housing assembly

A turbine housing assembly comprising:

• an inlet conduit portion of a turbine housing that defines an inlet passage having an inlet opening, wherein the inlet conduit portion comprises a bore, a cavity, and a valve seat, wherein the inlet passage is in fluid communication with the cavity via an opening surrounded by the valve seat;
• a volute portion of the turbine housing that defines a volute that is in fluid communication with the inlet passage and a turbine wheel space for a turbine wheel;
• a valve that comprises a control arm and a shaft coupled to an arm coupled to a plug, wherein the plug is disposed at least partially within the inlet passage when in the open state, the shaft is rotatably supported by a bushing disposed in the bore and wherein, in a closed state of the valve, the arm is disposed in the cavity;
• and
• a controller operatively coupled to the control arm to transition the valve between the closed state and an open state,
• wherein, in the open state, the plug moves into the inlet passage to restrict flow between the inlet opening and the volute, and to divert at least a portion of the exhaust flow into the cavity,
• wherein the cavity is in direct fluid communication with a treatment unit such that the diverted portion of the exhaust flow does not merge with exhaust flow passing through the turbine wheel space before entry into the treatment unit.