The belt was slipping before and I was only seeing 5psi. I changed the tensioner and there is no slipping at 6.5 psi. I went ahead and ordered a 3.70 pulley. I want more boost. I'm a manual by the way. Sent from AutoGuide.com Free App
Well, the standard pulley is set to get around 8 psi, but the catless mid pipe reduces back pressure some so that lowers boost a bit but I would still think you should see more than 6.5 psi.
How high are you revving it?