i was just browsing and i came across this site:
http://www.torquewind.tk/

some info:
it requires no extensive modifications, and better yet - no belt to rob your engine of horsepower! This supercharger draws its 12 volts off the power that your alternator is already making!

With over 500 CFM, this powerful supercharger will create up to 2.1 psi - all at the flick of a switch. And even though powerful, it will not damage your engine with overwhelming pressure - no bent/broken rods, no blow-by, no detonation - it is completely safe for your car's engine. Just flip the cockpit mounted switch at full throttle, and the powerful supercharger capable of running over 8000 rpm will supply your engine with all of the boost it will need. No need for a boost controller, or other expensive gadgetry - everything you need is in the kit. This supercharger's results have been tested with a precision accelerometer - don't be surprised to see your 0-60, 60ft, and quarter mile times decrease


you can find this electric supercharger on ebay in US for jsut over 100US

WONDER IF IT WORKS??