True but the point is a tune definitely voids your warranty. With a Piggy back that is non traceable once removed the dealer would have to prove it which I doubt would happen.
Yeah, if you pop your motor and they go back and check the logs and see youre running 21 pounds of boost, when stock is 18, have fun explaining that. the truck has a data recorder, if anything fails, and you have anything that increases power, they will be able to tell.
But if you sleep better at night thinking a piggyback is okay, more power to you.