Theres a reason. You hand out a key to the car that is extremely fast and dangerous in the hands of the wrong person, you need to cover your ass. You detune it, and let them make the call to use that tune, therefore releasing yourself of all legality if they go and mess the car up. I'm sure there will be someone who uses that tunes, fucks the car up, and wants ford to fix it. They will look at when and what was going on when it was blown, and probably tell them they are a dumbass running it 7500 rpm's going to work in 110 degree weather.