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

Car lift, yes.
Torches? No....I'll weld this with the MIG.

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Wait until you have got to bend the exhaust pipe in order to get it to fit right.

A little heat used in the right place with the exhaust bolted up and you can bend the pipe in the direction needed.

You won't be able to do this while the pipe is out of the car.

Mig is great after the pipes are correctly orientated.