Cars Simplified

The Intake Manifold

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The intake manifold is a part of the intake system which is usually what a throttle body is bolted to. It is almost always made of metal, since it has to withstand the vacuum pressure generated by the suction of the engine.

The intake manifold is usually cast using sand to shape the internal passageways, so those passageways tend to be rough when stock. Sometimes these are ported and polished to improve power.