I have a code-3 pulley, LET tune, CAI and deleted rear cats. One of the members went to the track with me and the only mods he had were for cooling purposes only, and we got to race each other. He had the spacers, HE and Johnson pump. I actually watched him slowly creeping up on me near the end of the 1/4! My power was dropping off, while he kept pulling! While idling, I noticed his water temp was right around or lower than the halfway mark, where mine was slightly above. So seeing this with my own eyes has convinced me to upgrade the cooling also. At least the temps will be coming down and once Spring arrives, that's when I'll do those upgrades, along with methanol injection.