Just got my Remus US SOUND on. I'd have to say, ya needa make it alittle bigger at the rear to mount onto stock exhaust after cutting off the muffler. It was like 2.5 0.1, It was a pain to wiggle it on after cutting off my stock mufflers. I understand ya really don't want it to leak lol But in the end, it sounds great even with 2 cats on. Asloud as my old Vangaurd. SORRY FOR THREAD JACKING!