Somebody should try them, and give us a report, rather than just pointing out potential problems!
They do have wide tube pipes, and are supposed to be SS, although you could run into issues adapting a 2 1/2" pipe to the stock header collectors, but if you have the Hall Pipes - that might be a good thing...
You might want to change the collectors & tailpipe to a flange clamp.
(OOPS - There I go, pointing out potential problems!)
ONE WOULD THINK.... That they built a jig from a stock Ansa system, and can bend a tailpipe to match the original curves & dimensions...
I can't find my pictures of my tailpipe fabrication, but that's what we did.