My friend purchased an '03 GT. It's modded and has a performance chip on the CPU of the car. Mods are a Steeda CAI, Bullitt Intake, JBA shorty headers, stock H pipe that was modified into an X pipe, Magnapack cat back. He wants to remove the chip so he can run 87 again. When removing the chip is that all you have to do? Will the CPU go back to stock? And, should he, with those mods, remove it?