I have a 2003 GS 430. So far I have put a SRT Intake and piggy back computer. It has the Borla exhaust, which is really starting to sound good, don't get me wrong, it sounded good to start. Now that it has been on the car for a year or so, it seems to be a little louder, which is just fine. :D I just recently replace the factory rubber with a set of Kumho Ecsta MX, (255x45yr17). Nice and wide, and very sticky once they heat up. Had the car at 140mph and the ride was awsome!!!
Lots of fun jacken with the Mustang GT boys, leave them scratching thier heads when you run off a leave them. :D