keeping a car under warranty really depends on your service department that you go to. for instance, if you get an aftermarket intake, you could have one dealer that is a prick, and will void your warranty if you have any issues, whether or not your intake cause the issue. then there are other dealers that will only void your warranty if they can prove the intake caused the issues. A lot of dealers will only void part of your warranty. like with the aftermarket intake, they will no longer warranty your intake, but they will still keep the warranty on your power windows, leaky muffler, etc, that has nothing to do with the intake. Go ask the service rep you will be taking your car in for service, if they have issues with modifications. Now, if you get a tune, you can pretty much count your whole warranty gone. lol got to pay to play!