Just make sure you put the FMU on right.........
PWR_RYD93 is right, 4psi for every # of boost.
Before winter hit, I had not had a chance to get mine set correctly. I was seeing upwards of 85PSI at WOT and 8#s. WAY to much. I got a BEGI and it does not use a disk, there is a bleader valve that controls the ratio. I am trying to get it around 60psi at WOT