IDSmoker and I developed the $.25 fan mod. a couple years ago. We developed it primarily for track use, because it keeps the fan(s) running at all times, even with the key off. We used to run them continuously for about 3-4hours at the drags without ill effect. It would easily cool the engine temp. down 20-60 degrees between runs, depending on how long between runs. I don't believe any of the other fan mods. to this. For street use, as said above, get a Diablo Predator, and you can control them as you see fit.