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

I messed with the Jegs kit and gave up and took it to a muffler shop.

I think what screwed me is the Jegs kit was for its own cheaper muffler, which was a few inches shorter than the Dynomax mufflers I have. This threw the geometry off from the muffler on back and it seemed like no matter what types of mods I made, I'd fix one problem and cause one or two more because of it. After futzing with this on the floor on my back for over a week, I gave up and took it in.