[black281]

HenDawg, welcome to the board! First off is your car an auto or a stick? As far as knowing which 4.6 liter motor you have it is definetly the 2 valve since you have a GT. The 4 valve 4.6 liter is the motor that ford puts in the Mustang Cobra (starting in 96 till present). As far as the mods you are considering, well here's my advice: the MAC cold air kit really is more for show under the hood rather than getting any real performance gain. The steeda pullies is a must do, I have them also and notice a good gain. The Diablo chip is going to adjust timing which can also be done which a Steeda timing adjuster. I would recommend the Timing adjuster instead, for one its cheaper and the mail order chips seem to be a hit or miss for people as far as picking up significant gain. If you really want to wake up the car you should looking into getting some of these following parts: X-pipe, some free flowing mufflers, 4.10 ring and pinion, C&L Mass air meter, Steeda pullies and timing adjuster. That should be a real good start. Have fun and happy modding!