[SactoJim]

Yes, primaries are 1.625. That's good news if that's the case....not real interested and spending a bunch of money for new headers if the improvements would only by marginal. You do confuse me on the "H" pipe maybe being a restriction.....I have dual 2.5" exhaust all the way to the back with a 2.5" crossover pipe (H pipe) about 12" beyond header collectors.....don't understand how that could be any kind of restriction. Appreciate the info......Jim.