A friend of mine has an '03 Trailblazer, with the 4.2L I-6, I believe (I know it's a straight-6, just don't remember the number), and he's looking for a supercharger for it. I know there is one out there.. I've seen it/read about it before, but can't seem to find it now. Anyone have this installed on theirs, or know of anyone with one? What are the gains? How much does it cost? Is it worth the money? How's the fit and finish? How much of gains are there on the "butt dyno?"

Thanks for the info.