All due respect, nobody is arguing that headers will out perform factory manifolds, of course they will, especially a warmed over engine. The question is, how much gain will Extrude Honed factory castings offer over untouched castings, and is (whatever that gain is) worth it?
Scott, it seemed that the original poster was considering going with headers and I just posted an actual comparison between the 2 different setups. No doubt that headers make a big difference in a warmed over engine! But in my opinion the extrude process is not worth the money for the small gain if any.
