I have a 12 GT w/Brembo Brakes, 3.55 gear, 6M, etc. I've been considering the options for a little extra power, but I am VERY concerned about the different aftermarket tunes and blowing out #8 cylinder and having no warranty to fix it. Therefore, I am looking at the Ford Racing Power Pack - K&N filter w/ProCal tuner, or just getting the K&N CAI which does not require a tune (if I have a warranty issue after the K&N CAI is installed, I can R&R it with the original A/F back to stock). The Power Pack adds about 16hp and the K&N CAI claims 20hp. I hope the 16hp for the PP is comparing the stock tune using 93 octane just as the PP tune requires the 93 octane (otherwise it's not a fair claim). I do realize the PP tune adds 60 lb/ft of torque at 1500 rpm's, so the results of the PP should out perform the K&N CAI. But with the K&N CAI I can run any grade gas at any time, not so with the PP tune. I can buy the PP for $308 + $100 for the install (I'd do the install myself, but a Ford Dealer must do it for the warranty); and the K&N CAI can be had for about $340 which I would install myself. I drive my 'stang on a regular basis and love the power, but I don't "race it", do burnouts or go to extremes too often (it scares my wife when I do). I do go to Grattan Raceway (2 mile road course w/11 turns) once a year for some real fun. I do like getting decent mpg on the highway cruising at 75mph or so, and I don't like buying premium gas if I don't have to. I have just over 5k miles on it after 8 months of driving it (not counting the 2 months of storage). So what suggestions do you guys have? Are there other options to consider?