I wouldnt really get too into modding a car if you are really worried about a warranty Besides, I think its called the Moss Ferguson Act, something along those lines, that says that ANY aftermarket modification CANNOT void an ENTIRE warranty, unless of course you roll the car and light it on fire... nevertheless, the aftermarket product would have to cause the failure/fault of the part to be denied warranty work.

Now, that said, Mastro is real friendly with aftermarket cars, when i first went there, i actually got a surprised response that i didnt have the full turboback! I dont think anyone there would give you a hard time about a boost controller, especially if you have AC or window problems! Nevertheless, i ran an AVC-r for thousands of miles with what seems like no problems, my only reccomendation is to get the uppipe and or resistor done so the damn EGT sensors dont fry out Other than that, if you are really scared of warranty work, Leave it Stock thats your only way to guarantee that your ass will be covered