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with ther stock manifolds. TTpete did ~600 rwhp on pump gas, but he has Greddy manifolds which flow much more, less chance of exhaust gas reversion into the cylinder. Regardless of everyone's theory. ~550-570 rwhp is the most that will be had with stock manifolds, even if they are Extrude honed, but this begs the question, Why not have a set of manifolds made, or buy a set of pentroof's?
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