An exhaust system is usually tubing used to guide waste exhaust gases away from a controlled combustion inside an engine.  The entire system conveys burnt gases from the engine and includes one or more exhaust pipes.  Depending on the overall system design, the exhaust gas may flow through one or more of: Cylinder head and exhaust manifold A turbocharger to increase engine power. A catalytic converter to reduce air pollution. A muffler to reduce noise.