So I'm curious I currently run muffler deletes on my Mustang and was wanting to delete my cats would running the stock X pipe matter? Or would the after market ones really make that much of a difference. I was planning on running some GT/CS manual mufflers I picked up. Along with the deletes.... just don't wanna run straight pipes lol.

(just FYI my state doesn't have emmisions and I have a tuner...)