Originally Posted by PhilStubbs

all of those pumps are way overkill except the 1st one that is way too small. they would all work but the 3 big ones would put a lot of strain on your alternator and i dont think the small one would move quite enough to be very effective. you need something in the middle of those. i know the attraction to water to air intercoolers, but i am pretty sure i remember reading that they arent as effective as air to air intercoolers. you may want to do some research to make sure it is even worth it before spending more money on a water to air system

Originally Posted by www.procharger.com

Air vs Water
Accessible Technologies manufactures both air-to-air and air-to-water intercooler systems, and the guidelines for their usage are fairly straightforward.

For automotive street applications, air-to-air technology is easy to install, highly effective, extremely reliable since it has no moving parts, and requires no maintenance. Air-to-water intercooler systems, on the other hand, are much more difficult to install as they contain an intercooler, a separate radiator to cool the water, a water tank, and a pump. But probably the biggest drawback to air-to-water on the street is that this technology requires the addition of ice to match the efficiency of air-to-air technology. Additionally, the requirement of ice and the possibility of pump failure or leakage means that air-to-water is also inherently less reliable.

For race-only applications, air-to-water works well since the need to add ice at the track prior to each run is not a big drawback. The other issues are the same as listed above for street applications, and efficiency will be comparable with the use of ice.