nah.. pull the resonator if you so wish, it will not void the warrant.. ive find this out a few times already. that was the first mod i did to the car since it was easy. when i blew up the motor nothing was said since it wasnt on there at that time.. and i know they saw that it was missing because they pulled the entire motor out. so in answer to your question, it wont, err.. should not void the warranty, unless your dealer is a real big prick..