The Optimized 72mm Throttle Body is a performance modified version of the 3.7L V6 throttle body used on the CX9 and 2nd generation Mazda6s. This part is a factory replacement Mazda part that is fully disassembled and rebuilt using all the optimization techniques shown on this website. The 72mm throttle body has also been tested on the 3.0L Mazda6 with no CEL or drivability issues. (Note: A manifold spacer, extended bolts, and CAI adapter are needed for installation.)