C&L Air Intake with SCT X-CAL2: www.brenspeed.com/mustang_2005

SCT X-CAL2 comes with three programs (87/89/93 octane) - probably going to go with the 93 which should give me an additional 30HP/35ft-lbs at the rear wheels or 50HP/60ft-lbs at the crank - this is optimistic, though. That will put it at the same output as my old 2002 C5 Corvette from the factory (350HP/360ft-lbs at the crank).

Supposedly this won't affect my warranty - I really don't care.

For this:

The best way to use the tuner is to have the car tuned on a dyno. I found this out on my 05 gt.  The numbers the cai and tune claim are just not there.  Just my .02  Cool car!!!!!