Max PSI in the mid-range would be around 19psi. I would lower it for a DD setup. It tapers to redline at around 14-15 PSI i believe, as long as you are FBO.
There isnt a end-all-be-all specific PSI. It changes throughout the rev-band. You also have to consider the transmission and power/torque levels. An AT might run less boost in the mid-range to spare its transmission, while a 6MT goes balls to the wall.
Last edited by Eric335; 01-27-2013 at 10:33 AM.