i've got vortech v2, 2.87in pulley making 12psi w/ intercooler. amount of psi per pulley size will depend on redline and shifts. that's why some people make diff. psi with same pulley.

 

see you have a smaller blower thats why you get 12psi with a 2.87 i get 10psi with a 3.60 im sure a 3.33 or 3.12 i would see 12psi with it see its wierd man how th boost on a blower works its all about ratios and junk that only luckythirteen can understand cuz hes some type of genius