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An exhaust manifold or header collects the exhaust gases from multiple cylinders into one pipe. Usually constructed of cast iron, it conducts the exhaust gases from the combustion chambers to the exhaust pipe. It has smooth curves in it for improving the flow of exhaust. The exhaust manifold is bolted to the cylinder head, and has entrances for the air that is injected into it. It is usually located below the intake manifold. A header is a different type of manifold; it is made of separate equal-length tubes.

There is also an intake manifold which directs fresh air, after it passes through the air filter and carburetor or throttle body, to the various combustion chambers (piston cylinders).

And it should also be noted that, on some fuel-injected engines, what is often referred to as the fuel-rail, is also a manifold. It's purpose, of course, being the distribution of fuel to each injector.

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