Exhaust system of internal combustion engine

摘要

An exhaust system of an internal combustion engine is described, which has an exhaust gas inlet tube (4) extending from the engine. A muffler (1) connected is at its inlet side to the exhaust gas inlet tube (4). The muffler (1) includes first and second exhaust gas flowing passages. First and second exhaust gas outlet tubes (5,8) are respectively connected to the first and second exhaust gas flowing passages and extend from the muffler (1) independently. A flow controller (12) is arranged which steplessly varies the flow passage area of the second exhaust gas outlet tube (8) in accordance with the pressure of the exhaust gas discharged from the engine. The flow controller (12) continuously increases the flow passage area with increase of the magnitude of the exhaust gas pressure. <IMAGE>