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The exhaust manifold, usually constructed of cast iron, is a pipe
that 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
under the intake manifold.
A header is a different type of manifold; it is made of separate
equal-length tubes.
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