Friend of mine swears by the same thought. His idea is that the max diameter for a small block exhaust is 2 !/4".... He's going to come over when we build the tubes and pipes for the 'Maro, then go along when we dyno the car.... We have a huge side bet (20 oz. Diet Coke) on the results...... If he wins, I'm gonna have one fast old chebbie!!!!!!