Just FYI, I decided on crush bending some 2.25" pipe and welding my muffler on. It was what I could afford to do, and it's sitting in my garage right now. If it's too loud I'll throw a resonator in the middle somewhere.
The next step is to take my factory system off, I'm expecting that to be a [censored] with the rusty, seized up flange bolts. If they're too stuck I guess I'll try heating them up.
By the way thanks for all the help this past week or two.