An exhaust system is usually tubing Tubing used to guide reaction exhaust  gases away from a controlled combustion Combustion  inside an engine. The entire system conveys burnt gases from the engine and includes one or more  pipes. Depending on the overall  design, the  gas may flow through one or more of: the cylinder head,  manifold or header, a turbocharger ( to increase engine power) a catalytic converter (used to reduce pollution) a muffler or silencer to reduce noise. An pipe must be carefully designed to carry toxic and/or noxious gases away from the users of the machine. The gases from cars are very hot; the pipe must be heat-resistant, and it must not pass through or near anything which can burn or can be damaged by heat. In most production engines, the manifold is an assembly designed to collect the gas from two or more cylinders into one pipe. Manifolds are often made of cast Cast iron iron in stock production cars, and may have material-saving design features such as to use the least metal, to occupy the least space necessary, or have the lowest production cost. These design restrictions often result in a design that is cost effective but that does not do the most efficient job of venting the gases from the engine. Inefficiencies generally occur due to the nature of the combustion engine and its cylinders. Since cylinders fire at different times, gases leave them at different times, and pressure waves from gas emerging from one cylinder might not be completely vacated through the system when another comes. This creates a back pressure in your system and restriction in the engine's exhast system that can restrict the engine's true performance possibilities. An exhast system must be carefully designed to carry toxic and/or noxious gases away from the users of the vehicle.

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