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Just a thought/question have any of you ever tried to improve the flow of the hi-po manifolds? I mean like grind away all the bumps inside of it (as far as possible anyway) and smooth it all out? I know it won't match the flow of headers but it would improve it right.

So for my 400 HP 340 which would be better Doug's headers or 340 hi-op manifolds? Would I lose a lot if I went with the manifolds and has anybody had their manifolds coated like the headers come? Also am I going to have problems with either inconjunction with my eddy head? Thanks in advance (if...