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

Kern Dog said
I like to do everything that I can here instead of relying on outside vendors or shops.
I saw these:

https://www.flowmastermufflers.com/...r_components/direct_fit_pipe_kits/parts/15826
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Does anyone here have any experience with these? I'm looking to swap the exhaust in my 67 Dart when I do the engine swap. It will have headers, an H pipe, Flowmaster mufflers and 2 1/2" pipes so these seem to be a logical choice.
Free shipping too.
The goal is to piece together a good exhaust system here at home without going to a muffler shop. I also need to know if there is a way to swage pipes to slip one into the other for a more positive connection.
Thanks!

I used them. Typically you want to slide into the muffler.
I did about a decade in exhaust shops. Anyone with a pipe machine can dwell these up to an extent. But things like aluminum content of pipe or stainless pipe drastically limit the ability to expand. The pipe will split.