[nisco]

you can add anything you want to the car.... appearance wise.. or angine modification....
if whatever you add to your car is properly installed and does not cause any engine damage... or engine trouble your warranty stays intact... NO MATTER WHAT!!!
BUT! if your aftermarket part causes a problem/ damage to your engine your warranty is voided.... NOW LISTEN: if you put on an exhaust.. and your drivers side window craps out... the dealer cannot void your warranty.. because he has to prove to you that your modified exhaust cause your window motor to crap out....
usually a dealer will say.. oh! you have a cai... cold air intake your warranty is voided... and try to charge you up the ass.. and void the warranty...
which is bullshit.. do not fall for that
tell him if there is a problem with the engine caused by the cai then show you!
if not... get back working on my car....
jus make sure that everything you install is properly done... no halfassed stuff....
i hope it helps.. post up if you got somemore questions...
ohh and next time try a search.. this has been brought up many times