Good logical dollar saving advice in the above!
But on top of that, just make sure that the exh manifolds you use after getting the carbon blasted off there insides only have light rust scale left on the runner walls.
I have seen badly scaled up exhaust manifolds eat up a additional 12 to 15 hp over and above what was lost by switching from headers to exh manifolds!
And yes, the jetting was optimized in each case.
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I do stuff for reasons.
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