know how that is.. I'm suprised my dealership hasn't given me any crap about my aftermarket stuff.. cos you know they will indeed tell you anything you do thats not OEM, even replacing the radio can void your warranty.. most people beleive them and/or do not have time or resources to go through the court hassle.. its unfortunate really. My uncle wanted to get dual flows on his chevy 2500.. the dealership told him it would void his warranty on all emissions equiptment, the engines computer, and any engine parts because the truck isn't designed for that.. crazy stuff heh.
I did notice when the dealership did a lookover on my vehicle they did not put a check by "lights", I assume thats because of my clears, but they didn't say anything to me about it.