I have a new diablosports tuner for 98-04 GT, 98-01 Cobra, 01 Bullit, 03-04 Mach1, 98-03 v6. I purchased it from Americanmuscle.com but i no longer have the car. Its a great tuner will allow you to adjust timing, shift points (auto trans), rev limiters, speed limiters, engine temp, air/fuel mix, and lets you download tunes from website. If intrested call Brandon at 407-432-7567