Does anybody know someone or a fabrication shop that has a pipe expander that will expand to 4 1/2 inches. Reason being there's an amuse exhaust for sale as I am sure some of you have seen and everyone I've talked to about fixing or working with it said HELL NO. I would appreciate your help.

 

I'll just get it out of the way.

My vote: Go to Speedware (ask for Adam, tell him Ethan sent ya)
Everyone else: Go to Fordahl

done and done.