There is a law about mods and your warranty: Magnuson-Moss Act
It says that they cannot void your warranty unless they can prove that the modification is directly responsible for the failure.
An extreme example. If you mod the intake, and your power window stops working, they are still required to fix the window under warranty, since there is no possible way an intake can harm a power window.
That being said, it doesn't mean you won't have to fight with your dealer on it. There are definitely dealers out there that are much more mod friendly than others. So best bet is to call up your dealer's service department and ask them. Tell them what mods you are planning to do and if that will be a problem down the road. Just make sure you are talking to someone high enough up the food chain to actually speak on the matter.
