has any 1 tryed this charger? ?

i reaceantly came across this supercharger, it doesnt convince me that it works as they say it does, so if any one knows let me know, thanx.

http://page.auctions.yahoo.com/auction/93145945

http://page.auctions.yahoo.com/auction/93145945

it will work but only give you like one or two psi over normal preasure but about the price of a cold air so it could be worth it but dont expect it to compete with a conventional f/i system