WELL GUYS I WENT WITH THE SERT AND IT RUNS GREAT , NEVER RAN SO GOOD , TALKING WITH THE DEALER AND THE BIKE WILL STILL BE UNDER WARRENTY AS HARLEY RECOMMENDS USING THE SERT,BUT WILL NOT WARRENTY WITH A T-MAX , THEY ARE INSTALLING THEM ON THE '07'S CAUSE THERE HAVING ALOT OF PINGING PROBLEMS