Where to get pre bent exhaust pipes and any suggestions on how to swage them to fit over mufflers?

Kern Dog said

I would have to assume that it would be very little difference.

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It would be within the margin of error. Never noticeable on a street car


Also anything you swell up gets thinner and mire brittle. It will fail first. I would rather an easily replaced muffler rot out before a tail.
I've bent tails for a bodies in one piece,unlike flowmaster,I didn't enjoy it