thanks fatbooty, i was reading other posts about the afc and you always say put it at 40% and it will be good. would it make a difference on my car at all w/ intake header exhaust and tuned on a dyno. i know a place that can get it for 60/hr and maybe 50 is i bs w/ them enough. but would it give me any extra hp or better gas mileage at the least? or any tips on what i should set it at when i get it, or should i put it back to the stock reading and just adjust it when its on the dyno? thanks