Sry about the late response but yes the spark plug non fouler will work. I have a 04 compg and when i put in my headers even though the code was removed i would still get horrible gas mileage. The car goes into open loop and this is really the only way to fix that. It restricts so much exhaust going to the rear o2 sensor to make the car believe there is actually a cat. After i did it my car was getting like 9 mpg, it jumped up to 15-16 city.