i've been reading this thread and agree, you have to do other mods to gain the benefits of a smaller pulley (not to mention it's safer for the engine), but i see alot of talk about KR, and have actually done a bit of studying on this (Thermodynamics class), has anyone put some kind of octane booster in their gas to see if corrects any problems? or a synthetic racing fuel (103+ octane)? just curious...