That actually looks like it is not a good choice anymore.
The aftermarket fans are the earlier ones and they seem to burn out with out some kind of controler. 2 people tested it and although one guy got it to run for a while, it burned out when he applied 40 amps to it. it ran at 20 or 30 amps for several hours, but that was because he had it hooked to a charger that could limit the amp supplied.
don't know how to do that on a car.