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

I bought a Summit 3” kit for my Swinger. Fit like **** so I brought it into Boise Muffler and they made it fit like glove and added a crossover for $300 !
Owner is a GTO fanatic and they do a lot of custom work . Couldn’t be happier !
Thanks. I'm not driving to Idaho to get exhaust done.

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