An exhaust assembly for directing a fluid comprising: a housing defining a cavity along a longitudinal axis; at least one internal treatment device disposed in said cavity of said housing the internal treatment device including a body spaced from said housing to define a bypass channel between said body and said housing said body defining an opening along said longitudinal axis; a valve body mounted to said housing and coupled to said internal treatment device with said valve body defining a passageway along a central axis generally parallel with said longitudinal axis and having an inlet and a first outlet spaced from each other relative to said central axis with said passageway extending between said inlet and said first outlet; and a vane rotatable about a pivot axis characterised in that the exhaust assembly further comprises a divider mounted to said valve body and extending into said passageway substantially parallel to the central axis toward said inlet with said divider intersecting said passageway to define a second outlet of said valve body spaced apart from said inlet and said first outlet of said valve body relative to said central axis with said second outlet disposed in said cavity of said housing; said vane being coupled to said valve body and being rotatable about the pivot axis between a first position blocking said second outlet of said valve body for directing the fluid through said first outlet into said opening and a second position blocking said first outlet of said valve body for directing the fluid through said second outlet into said bypass channel; the first outlet of said valve body being disposed in said cavity of said housing. a housing defining a cavity along a longitudinal axis; at least one internal treatment device disposed in said cavity of said housing the internal treatment device including a body spaced from said housing to define a bypass channel between said body and said housing said body defining an opening along said longitudinal axis; a valve body mounted to said housing and coupled to said internal treatment device with said valve body defining a passageway along a central axis generally parallel with said longitudinal axis and having an inlet and a first outlet spaced from each other relative to said central axis with said passageway extending between said inlet and said first outlet; and a vane rotatable about a pivot axis characterised in that the exhaust assembly further comprises a divider mounted to said valve body and extending into said passageway substantially parallel to the central axis toward said inlet with said divider intersecting said passageway to define a second outlet of said valve body spaced apart from said inlet and said first outlet of said valve body relative to said central axis with said second outlet disposed in said cavity of said housing; said vane being coupled to said valve body and being rotatable about the pivot axis between a first position blocking said second outlet of said valve body for directing the fluid through said first outlet into said opening and a second position blocking said first outlet of said valve body for directing the fluid through said second outlet into said bypass channel; the first outlet of said valve body being disposed in said cavity of said housing.