Leo posted an auction link to something like one of these, and I found a site selling them too. Looks interesting, this one says up to 750 CFM, but I don't see how it could really "compress" the air like a real one does. It says up to 2PSI boost-- Assuming it works at 2psi, is it possible you'd even feel a difference?? Maybe I'll try to download some "leaked" instructions just to play around with it.
http://www.esuperchargers.com/
http://www.esuperchargers.com/