Exh manifolds in an Early A...

Sorry, my point was that no matter how much flow the larger pipe gives you the smaller 1 5/8" pipe will restrict (control the flow) in the end. What I'm trying to say is that you could put a 4" pipe behind the manifolds and it won't make much difference because the manifolds are the biggest restriction in the exhaust system. I know you have to do what you have to do, just trying to help with info. treblig