I have thought about this and found out that the remote control airplane engines would work much better than their bilge pumps, last longer, and use less electricity. But as for a HP difference I'm not sure. I bought the electric fan that should work. I'm just figuring out what kind of relay I would need to turn the 12 volt fan on at either WOT or a certain RPM. IF anything I bet it gives you a little better gas mileage from the "swirl" effect of the fan =P I'm no tseriously interested in it just thought hey for 20$ if it works it works, if it don't then I'll tell everyone but that's a side project that I haven't worked on or thought about in months lol