Patent ID: 7559196

Claim:
An exhaust system of the internal combustion engine comprising: upstream main paths for cylinders that are attached to a side of a cylinder head and extend towards a side of the engine, and are connected to the respective cylinders; a downstream main path in which the upstream main paths join so as to become one flow path; a main catalytic converter provided on the downstream main path; bypasses that are split from the upstream main paths or the downstream main path; a bypass catalytic converter that is provided on the bypass; and flow path switching valves that open and close the upstream main paths so that exhaust discharged from the cylinders flows into the bypass, the bypass catalytic converter being provided below the upstream main paths, the bypass catalytic converter being arranged so that the exhaust flows in the bypass catalytic converter along a cylinder arrangement direction where an inlet portion of the bypass catalytic converter is positioned on a side of a first cylinder which is on one end of the combustion engine and an outlet portion of the bypass catalytic converter is positioned on a side of a second cylinder which is on the other end of the combustion engine.