Every state has different laws about this.. some allow it as long as they are not red or blue or flash type of thing other states say they modify the vehicle and no.. So check with the local authorities. If the car isn't on the road you can have a police rack on top blaring berries and cherries as long as it isnt on the road.. Warranty wise the only way this can void the warranty is is the dealer can prove that those lights caused the damage to said part.. In few cases they can or are willing to investigate it.. So no most likely they will not void the warranty..

It's illegal while driving but No it doesn't void the warranty . Your not messing with anything mechanically it's like asking if puting a stick voids the warranty .

In many states, these are illegal. Check first.

Just installing something does not void a warranty, does not matter what state you are in or what you install. Whether they are illegal or not is a different situation.

Why don't you ask others in your ghetto?

I'd like to get the kit for my new Camaro (not now but soon) and I'd like to know if installing it would void the warranty on the car, even if I have it professionally installed.