Whats the purpose in the idler? I dont seem to have any belt slip but my power on the dyno was also lower than expected. Mods are as follows 2.59 pulley, frpp intake, frpp shorty headers, no cats straight piped, and a custom tune from a very reputable local tuner. Made 525/528 do you think theres more left in the tune? I always am wanting more of course what should be my next relatively inexpensive step lower and aux idler maybe? Also have a dry nex n2o system in my garage being unused. But my car is being tuned with hptuners so no way to switch between n2o tune and no n2o tune. My tune would then become a lame pig rich tune to accomadate for the extra fuel the n20 would need correct?