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Stock LS1, Stock Heads, LPE GT2-3 cam (207°/220° x .571"/.578" x 118.5 CL), Dynamaxx Long Tube Header system w/ cats, Z06 Catbacks.
The magancharger has a 3.20 Pulley, but I am installing a ECS Overdrive Crank, which I figure would make the 3.20 more like a 3.00 pulley.
If I had to guess, I would saw 7-8psi. Does this sound about right with the cam and headers?