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Best HeadersHowever, since cast iron is thick, it can make it difficult for exhaust gases to pass through. Additionally, with an exhaust manifold, the exhaust gases from each cylinder pass through the same structure, which inhibit their flow. The diminished flow of exhaust gases creates back pressure that lowers engine performance. Exhaust Manifolds vs. Headers: What You Need to KnowOf course, there’s more to it than that, so let’s dig a little deeper into the differences between exhaust manifolds and headers.
The exhaust manifolds collect exhaust gases from the ports in the engine’s cylinder heads, then route those gases to the rest of the exhaust system.
What is an Exhaust Manifold?