I've been toying with trying to use the supercharger off of a Toyota Previa, they're belt driven, plus AFAIK they are a centrifugal supercharger (I think that is the correct term, looks like a big belt-driven turbo) I know the TRD supercharger for the Scion tC is like that, but it's got a big arse shaft on it, and it's $2500
bit if one ever comes in with a broken shaft it probably would not be all that difficult to shorten the shaft.
