There was a law put in place in 97 i think that says that the dealer has to honor the warranty as long as the aftermarket parts installed are not effecting the component effected. (Example you could have a NGM built motor but if your seatbelt stopped working they would be obligated to replace it). Thats a very specific example though and its open to a lot of interpretaion on the dealers part, but as long as you can clearly prove that the aftermarket components on your car are not contributing to the problem they should be obligated to fix/repair the issue.peachferrari said:Go to whatever dealer you plan to use for service/warranty issues and talk to the service manager. In my case, mine said I'd be just fine with an intake and a catback exhaust. Anything else and they'd probably give my crap if I needed warranty work.
I have seen other dealers that will even go so far as to install a supercharger for you, so it just depends.