I had one on mine & it ran so lean it was off the chart, dropped in a pro-m & it made a major difference, still lean but atleast in a semi safe range, same thing the dyno shop told me but I still have my lean problem I'm trying to troubleshoot but pro-m did help "alot" and pro0m make a optimiser so you don't have to recalibrate & you can adjust air/fuel rations etc.