Dunno know if it counts as a purchase, but I just had my 2004 Mustang Cobra dyno'd and tuned, again. I want to be able to run a race tune, and not just my street tune. Now I can run the race tune, and run around 625rwhp, versus the street tune of 556rwhp. I got a great price because I had it tuned at the same shop that did all my work, like installing the Kenne Bell supercharger, clutch, flywheel, aluminum driveshaft, suspension, brakes, exhaust, wheels, jeez, everything you can think of lol. Man what an investment, this thing pulls like a rocket now woot!! Of course not on pump gas, the street tune uses 93 octane, but the race tune I have to use higher octane fuel, expensive, so I won't run it often, only at the track. Except that I coudln't help it and had to drive it around town on the race tune just to see what it would be like, absolutely sick!! So much fun these cars, if you don't mind spending the big $$ on suspension, brakes and weight reduction, otherwise ya can't compete with the Z06's.