Originally Posted by XwChriswX

Unless you get a real douchebag of a dealer, the exhaust will not void the warranty, unless they can prove that the mod was the culprit in whatever you're trying to get fixed.

i.e. If you change your exhaust, and your transmission needs to be worked on, the exhaust will NOT void your warranty on that. (again I will say should since some dealers are dicks and will try to screw you over saying 'more power = blown tranny')