Warranty Issues

[Snipes]

What kind of mods would void your warranty? I\'m thinking that if you were to put in a custom stereo, modify some lighting which hooked into the 12v jack or even install a remote starter with alarm would these void your warranty. If not does that mean they have to be installed by a certified mechanic?
What can we do ourself that is fine by the dealerships?

[bluntman]

If there is a problem, the dealership has to prove that the mod was to blame.

[Xenon]

Remote starters may void the warrenty on the 3 because you have to fiddle with the immobilizer system built into the ignition and the keys.