it will sound like shit and pop a lot. btw here's a good rule to follow. if you run chambered mufflers you want to run an h-pipe. if you run straight through mufflers run an x-pipe. this will yield the best sound. there are exceptions to the rule but not many....ok, I have a bone stock 03 GT. I am thinking the car would sound pretty good with an off road x pipe and stock mufflers for now. Has anyone HERE ever done this and liked the way it sounded? Just wondering.