I was just wondering about Supercharging my 1997 VT Commodore, I want the biggest Twin Screw Valley Mount Supercharger I can get thats Legal. Another option would be to get the biggest Vortec Belt Driven Supercharger I can get thats Legal. The engine is

Legally the only blower that you could fit would be one from a factory supercharged V6, without expensive certification/development etc. To be honest, depending on your budget, I would highly recommend doing a factory supercharged V6 (L67) conversion and be done with it. They don't go too bad with a couple of mods as shown in the link below :)

http://www.youtube.com/watch?v=4p4jGXpZFQY