might be a dumb question but whatever...i want to turn up my boost, so how do i know what size pulley to get? i want to run somewhere in the lines of 14-15psi, with a p1sc and 3 core intercooler. my existing pully i dont know the size of it, so where do i measure it at ( do i measure the diameter of where the ribs on the pulley are, or do i measure the diameter of the outside, which would be prolly a half of an inch larger)?? as of now the rib diameter is 3 inches, and the outside diameter is 3.5 inches. i am hitting around 10 psi as of now, so anyone could help me here i would appreciate it, thanks a lot