I have an 04 cobra and I'm in the market for a bassani off road x-pipe. I have seen a few used pipes listed for 2001 through 2003 gt's and mach's. The mach pipe would have to almost be the same as the cobra, would it not ? I even looked on proficient performance and the list for the cobra,mach and gt are the same pipe in one application. If you scroll down more on the list an 03 cobra pipe is listed seprately and they also have a diffrent listing for an 04 cobra. Now I know the 03 and 04 cobra's are identicle except for the year. The only thing I can see diffrent would be their price. Any input would be appriciated.