A friend of mine bought a supercharged mustang got out of state with the rear cats deleted and since I live in a state that requires them for state inspection this is an issue. I have hptuners that I?ve tuned my car and truck with but this is my first mustang. He?s getting a p0420 and p0430 code. How do I go about removing this so the mil light will be off and monitors will pass when they plug it in?