please help about supercharger pulleys

Hi, I have a 1996 s/c buick Riviera so ive been trying to trick my car out so far I got new exhusts and cold air intake with k&n filter....I hear u can get a smaller pulley for this car at pulleyboys.com which pulley do I need? and what size? and do I need to buy the tool and a new belt? please tell me all the imformation about it thanks.

Everything you need to know will be on the site below;

Pulley Boys (http://www.pulleyboys.com/)