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#21 |
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BANNED
Join Date: May 2010
Location: Wa.
Posts: 5,423
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Several people (John Lawson included) have done comparison dyno tests between stock exhaust manifolds and headers.
It takes at least 3 hp to feel a difference in performance in the seat of the pants. This never happened. They did NOT however compare header types. We DO know for a fact that "W" type make more hp on a race engine if they are big enough. |
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