I have a 2002 GT, Im currently in Iraq, and will return back beginning of next year, I only have about 10,000, on my car and want to due alot with it, Wife gave the ok, It was weather parts for my car or a new Crouch Rocket, so you know what I plan to due, so far I have only added the K&N air charger kit, and already plan to put 4:10's, but now does the stock muffler come in x or H pipes, so will I have to only install mufflers or do I have to put in a new cat back, also a friend of mine here has nos on his car and claims it better than a supercharger, I just dont know, any suggestions?