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12-15 psi is about what a stock truck with the intercooler will make. Mine was about 14 before I started down that long and expensive road of modifying the truck 
Doesn't take much to start getting bigger numbers. Intake, exhaust and turn the pump up and you can get to 25 psi or so. Add injectors and get to 30 or so. Timing, Lift pump mods, porting, water spray, nitrious, etc. all will add to the power level, just depends on how far you want to go. There are a lot of variables in this and remember that an intercooled truck will not behave the same as a non IC truck.
Doesn't take much to start getting bigger numbers. Intake, exhaust and turn the pump up and you can get to 25 psi or so. Add injectors and get to 30 or so. Timing, Lift pump mods, porting, water spray, nitrious, etc. all will add to the power level, just depends on how far you want to go. There are a lot of variables in this and remember that an intercooled truck will not behave the same as a non IC truck.
