Towcat, anything else can be done to increase the pressure these factory units make??? I only get 7psi max. Ive got the outlet and 3" down pipe from ATS so that helps exhaust flow.
have you made sure you have no air leaks first?
secondly, have you tried blocking off the wastegate?
third, if you ever mapped the turbo, you will find it is most efficient from 6-9 psi. anything more is generating excessive heat from the compressor side of the turbo and that works against you.
i normally boost 3-5 psi and when working the truck hard, I'll get to 6.
i have no problems kicking the rear loose on the truck when going around a turn.