AMS PERFORMANCE CARBON FIBER SHIFT KNOBThe AMS Mitsubishi Evolution IV V VI VII VIII IX X Carbon Fiber Shift Knob was designed to extend the length of the shifter which aids in shifting throw and keeps the knob closer to the drivers hands while road racing. NON EMISSIONS RELATED This product is either entirely unrelated to an emissions controlled engine, or we believe this product does not affect vehicle emissions or any emission control devices on the vehicle it is intended for, that