Please help me about pulleyboys.com plzzz

Hi I dont know much about engines so please explain.........people say that if I get a smaller pulley it should add about 20 horse power....but I dont know which pulley I need to get from pulleyboys.com....and do I need to by the tool and a new belt and ....who do I ask to put it on I cant put in on myself? plz answer me thanks

if you have the series 2 engine get a 3.4 inch pulley. You wont need a new belt, the stock belt will work fine. You may want to look into getting a bigger tensioner pulley though.