When I had trexturk do the exhaust on my A4, I had him chop out the resonator and mufflers so if I ever sold the car(and I did) I could just have him reinstall the mufflers and resonator but with new piping that he (or any exhaust shop) could easily fab up.
Isn’t this the guy that is trading the car in? Why does he care what exhaust is on it?