Please excuse the bad pun....It has been a few years since I have done the MOPAR mix and match....after looking at the butchery on the exhaust system on my new to me 80 Duster. I was thinking about digging into the parts pile to put a set of duals on it. Currently it has stock mid 70s passenger car manifolds on the 318. In my pile I have a set of 72 E/B Body 340 exhaust manifolds. I know if I slide the tank over one strap I get room for A-Body tailpipes. Is there a Factory head pipe that will work with these manifolds? In the past I would have just taken it to the muffler shop to get them bent. The local shops here are not much help. If it is not in there system they can't do it. So i was thinking E-body or B body head pipes. I do have concerns. Are 2.5 inch pipes overkill on a low comp 318 with a thermoquad? 2 and 2.25 used to be the go to for small block exhausts. Any ideas here? Thanks