In order to relief a sudden change of engine sound during the transition to recovery control of a particulate removing filter or during returning from the recovery control, a system of treating exhaust gas of an engine includes an exhaust-gas particulate r...

The invention concerns a mounting arrangement of a throttle valve in an exhaust pipe (1) of an internal combustion engine, of the type wherein the exhaust pipe (1), or a portion thereof, has on the peripheral surface a pair of diametrically opposite perfor...