is there a place that has a list of available pulley sizes that i could buy? i have a 8 rib 8 # pulley and want to see if there is a 9 or 10 to step it up a little

 

Better if you use pulley size insted of boost numbers, boostnumbers will be misleading depending on crankpulley size, SC modell and engine size/flow.

 

Exactly. Find out what diameter the pulley is on your blower (it's usually stamped on the face), then call ATI directly, or one of their dealers for the next size pulley. The given rule of thumb is for every 0.1" you change the pulley diameter, you will change the boost one pound.