I have a 2003 GT and I purchased the American Thunder system from AM last year. It's too damn quiet for my liking. Anyway, I'm not sure if I should just purchase a different catback exhaust system, or try adding an aftermarket H/X pipe? I hate the idea of spending another $500+ on a new catback system, but I'm just not sure if an aftermarket X/H pipe will be loud enough? Also, I'm curious if a catted X/H would be much louder than the factory pipe?