Quote:
Originally Posted by Blubaron79
What's a water cooled exhaust manifold?
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They run coolant through the exhaust manifold (which is built into the cylinder head) to help control the temperatures to prevent it from getting too hot when under extreme duress. Overall it reduces emissions by preventing the catalytic converter from running too hot by allowing it to operate at a more effective operating temperature. It also helps get the engine up to temp earlier.