Obviously, different combos will yield different results.
I know someone with a pretty good running sb mopar in FAST that tested stock manifolds vs extrude honed ones back to back on the chassis dyno.
With his combo, it was basically worth nothing.
Dwayne - I remember talking to you when I was building the 511 with the exhaust manifolds. To quote you, I think you said (first) "why would you want to use those things", and second you said "don't waste your time trying to make them flow better". I did end up gasket matching them. It made me feel good.
