I hope this is okay, but I live in Chicago and have a new and unused allen supercharger kit for sale. I posted it up on stangnet classifieds. If there is anyone in the Chicagoland area that is interested, I would be more than happy to show you the kit. I will let go of it for a GREAT price!
I'm not exactly sure as to the nuts and bolts of it. But I know its possible. You can contact the guys at allenengine.com for complete information.
I doubt it will work on a '99-up Mustang. Other than the fact that the ports for the PI heads are mismatched to the earlier style intake, the '99-up Mustangs are based on a return-less fuel system, where the '96-'98 models are not. As such I doubt the computer tune, required fuel pump, etc would be compatible with the newer system. I mean…it could probably be adapted to work, but you’ll likely be close to the cost of a brand new system by the time you get all of the right components in place.
What brand is it and is it the complete kit for installing right away or does it still need all the fuel parts? also whats your asking price?