Maybe you could try one of these e-ram deals. Its at
www.electricsupercharger.com. Comes in one and two motor versions. It only works at full-throttle.
The electric supercharger concept is not a terrible idea on a street vehicle. But, the modest air pressure you are going to generate with these little motors -- at least on the jc whitney thing and the e-ram thing - probably make it more trouble than its worth - ie., in this case, "great, I spent $600 to drop 3/10ths off my quarter mile time in a frigging 2.5 Wrangler that, stock, does 0-60 in a rocket-like 15 seconds...
"
The Thomas Knight company,
www.boosthead.com, seems to have the induction pressure equation worked out with the electric superchargers and Knight has apparently been working on the designs for close to 30 years. Course, he is using multiple electrical motors which total 20hp on his kits. And, the setup is apparently as costly as a regular supercharger or turbocharger or more. Still, its probably a concept that's going to see more action as vehicle electrical systems go from 12V to 42V on cars/trucks and battery technology improves.
Anyway, doing all this on a 2.5 Wrangler? Not sure If I'd want an electric boost "anything" on an off-road vehicle. But, I'm not going to knock it too much until I've tried it (course, don't plan on trying it on my 2.5 Wrangler). But, if you have the cash, don't mind rolling the dice, and don't plan on encountering any water, then fire it up -- eram or whatever -- and let us know how it goes. Will certainly be an interesting story