Originally Posted by a351must2
To void your warranty Ford would need to prove that your modification caused the damage you are having the vehicle serviced for. Even then, the warranty isn't voided, it just won't cover damage caused by modifications you made...it'll still cover other issues with the car.
Exactly, So if you have a CAI and your MAF sensor has a problem, That part may be subject to not being covered, but they can't void your whole warranty based on it.
Basically mods are taboo now-a-days, Ford company pays to fix your car under warranty, not the dealer. If anything, they WANT to fix stuff under warranty because payment is guaranteed.