stock the ecm limits boost to 22/24 psi of boost no matter what tuner you have on the truck, the boost stick is about 100bucks and will raise it to about 28/30 psi depending on how much fuel you add with tuning! the boost controler will raise up to 40psi with the turn of the knob.
YOu do not want to push the stock turbo over 34 psi at all, it will pop. its not if its just when! THere has been lots of dyno testing done by folks and there is no benifit to running more than 30/32 psi with the stock turbo, any more than that the turbo drive pressure is outragious causing your egts to go back up and power to go back down!
Kennedy diesel is the only one who sells the boost stick, and any ppe dealer will sell there controler.