Well i bought both an o/r Prochamber, h-pipe, and flowmaster super 44's for the 04 cobra and there is a huge difference in sound. I just took off the prochamber and put on the h-pipe and im getting rid of the prochamber if anyone is interested to mellow... The h-pipe by far sounds the best as being the meaner/most aggressive of the two. People say that the gt's sound better well i have had a 2000 gt with the same set up and the cobra sounds just as mean or if not meaner... I thought i would post this since i have read several post about the difference in sound between the 2....
