Exhaust and Emission Control Systems

     The exhaust system quiets the noise produced during engine operation and routes engine exhaust gases to the rear of the vehicle body.

    An automobile exhaust system comprises of various devices or parts of an automotiveengine, which are used for discharging burned gases oi"' *teim. ' Erthaust systerii consists oftubing, which is usually used for emitting out waste exhaust gases with the help of acontrolled combustion taking place inside an automobile engine. All the burnt gases areexhaled from an engine using one or more. exhaust pipes. These gases are expelled outthrough several devices .like cylinder．,head, exhaust manifold, turbocharger, catalyticconverter, muffler and silencer.

    The emission control systems are used to reduce the amount of toxic（poisonous)substances produced by an engine. Some, systems prevent fuel vapors from. entering theatmosphere (air surrounding the earth). Other emission control systems remove unburnedand partially burned fuq from the ,engine .exhaust.