Friend of mine has a 2004 Gt wanted to buy an X-pipe. Went to buy one and bought the SLP Catted X for a 96-98 Gt, wants to know if it will fit his 2004. I told him no, but I am not sure. It is one of those 3-piece kits that come with lead pipes, cat, and then the x-pipe section. I told him to return it, but he said that the company he got it from has certain "Fees" that he would have to pay and he wants to try and install it.