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I was wondering myself how about changing the HID to a aftermarket would that affect the warranty? Another would be how about if I did a custom wide body kit on the vehicle will that affect any warranty. Also how about a aftermarket audio system, what will that do to the warranty? There's this case where my friend replaced the intake and exhaust with an aftermarket product, and he also had a sound system. But when he went to Lexus for a regular oil change, the technician said that he would not work on the car for those reason. His car was a 2001 IS300. Does every state have different warranty policies?