The exhaust system carries away the waste gases from the engine to atmosphere.  It consists of exhaust manifold, exhaust pipe, catalytic converter, connecting pipe, muffler and tail pipe.  The exhaust manifold collects the waste gases from each cylinder and sends them through the exhaust pipe into the catalytic converter.  The catalytic converter converts most of the harmful gases into safe gases and then sends them the muffler.  The muffler reduces the big noise of the exhaust.  The waste gases are at last released into air through the tail pipe.