Hello everyone, this is my first post and I'll try to stick to basics. I'm considering a few mods for my currently stock 05 GT and would like to see if you guys can give me some feedback and possibly save me from some bad choices... First, I am planning on purchasing a Borla cat-back kit and am wondering if anyone has had good/bad experiences with Borla and their performance. Ive been browsing the mustang magazines and plan on making the initial standard 3 mods which seem to be best- underdrive pulleys (Steeda was my first choice), cold air intake (again Steeda) and exhaust. Ive been told by the guy who i intend to use to tune and install these mods to not be fooled by the horsepower claims of the manufacturers. He said he dyno'd many 05 GT's and found, at the most, about 261 stock HP at the wheels. he also said the horsepower claims of most of the aftermarket parts producers are taken from the flywheel rather than where they count. He said that if I plan on getting any more than 310 at the wheels I would have to go to a supercharger, which I am hesitant to. Any thoughts for the rookie?