Originally Posted by boxmonkeyracing
But for the headers. . .you can install them on a car and it won't volid the warranty. at least my XP it hasn't.
Yeah Ive seen people get away with that. I think its a judgement deal. If something happens (blown engine, if the car goes into limp mode due to a trigger light...prolly wont happen to a GM product) and you're at have a uptight stealership/service department; Ive seen them write off the mod as the problem at vault and thus voiding the warranty. But that an extreme case.
Most cases you are safe.