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

I bought the kit from Jegs for my '74 360 Duster. Had to trim and fit every single piece, but now it's all welded rather than clamped. I also bought 2 sets of flanges and put them at the front of my mufflers, so I can drop out the mid section if I want, as the H pipe is under the trans tail housing. Yeah, it was way more work than I expected.

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This is a great idea:

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I think that there were a few years that later model Mustangs came with something like this.
For a manual trans car, this is really great since it would help to have it easily removable for clutch replacement jobs.
For automatics, it would help for drag racers that either like to try different converters or blow up the transmissions frequently!