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I think these exhaust discussions tend to blur the distinction between stock exhaust manifolds and an aftermarket tuned header. The header is designed to give a scavenging effect at a specific RPM range while the stock exhaust manifold gives little if any scavenging at any RPM and just gives back pressure. Mods using stock manifolds should be aimed at getting the exhaust out as efficiently as possible in the RPM range normally seen which in our case means a not oversized pipe and a low restriction muffler.
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