Calvin Elston @ Elston Headers picked our car up .13 with just a bolt on (255/350 ). On our bbc it was 15 Hp and 13 ft-lbs avg over Arnold Greene's headers.
We put the SBC headers on for a heads up run knowing we were out powered, but had nothing to lose. Won the rnd over a car that had us by .3. The other competitor now has a set of Calvin's headers. On the bbc headers... Arnold bought two sets one 427 and one 396.
http://elstonheaders.com/