Dodge Cummins before and after Banks PowerPack

91-93 stock: 13psi Banks: 21psi
94-98 12-valve: 16.4 psi Banks: 32psi
98-02 24-valve: ?

I would imagine you could go higher psi than that if you were to get an intercooler from a semi or some other large truck.

I would think they run two turbos as to not over-speed them. A 5.9L engine turning 3500rpm @ 50psi is ALOT of air.