Exhaust system for an engine

A snowmobile comprising:

• a frame;
• at least one ski connected to the frame;
• an engine supported by the frame, the engine having an engine air inlet and an exhaust outlet;
• an exhaust pipe fluidly connected to the exhaust outlet of the engine;
• a turbocharger fluidly connected to the exhaust pipe, the turbocharger including:
• an exhaust turbine, and
• a housing for housing the exhaust turbine;
• a bypass conduit disposed upstream of the housing and fluidly communicating with the housing, the bypass conduit including:
• an exhaust inlet fluidly connected to the exhaust pipe;
• and
• a flow divider positioned to face a flow of exhaust gas through the exhaust inlet, the flow divider separating the flow of exhaust gas into a first exhaust flow path and a second exhaust flow path;
• a valve disposed in the first exhaust flow path for selectively controlling the flow of exhaust gas through the turbocharger and diverting the flow of exhaust gas from the first flow path to the second flow path, the valve being selectively movable between a first position, a second position, and at least one intermediate position between the first and second positions;
• the flow of exhaust gas enters the bypass conduit perpendicular to the exhaust inlet along a central axis, the flow divider being placed on a bypass side of the central axis;
• an exhaust collector fluidly connected to the housing and the bypass conduit for receiving the flow of exhaust gas therefrom, the exhaust collector including a single collector outlet;
• and
• a muffler fluidly connected to the single collector outlet,
• the first exhaust flow path being defined from the exhaust inlet to the exhaust collector, exhaust gas flowing along the first exhaust flow path passing through the exhaust inlet, then through the bypass conduit, and then into the exhaust collector,
• the second exhaust flow path being defined from the exhaust inlet to the exhaust collector, exhaust gas flowing along the second exhaust flow path passing through the exhaust inlet, then through the bypass conduit, then through the exhaust turbine, and then into the exhaust collector, exhaust gas flowing from the exhaust turbine entering and flowing through the exhaust collector directly,
• the muffler receiving the exhaust gas from both the first exhaust flow path and second exhaust flow path via the single collector outlet, exhaust gas flowing through the exhaust collector and into the muffler directly,
• in the first position of the valve, at least a majority of the exhaust gas flowing along the first exhaust flow path,
• in the second position of the valve, at least a majority of the exhaust gas flowing along the second exhaust flow path,
• in the at least one intermediate position, the exhaust gas flows along both of the first exhaust flow path and the second exhaust flow path.