I called and talked to Jimmy. He's got this kit on his car and a stock motor.
With the 4.25 upper his car makes 16psi with longtubes.
If you're on stock manifolds it will likely make 17psi.
He's also running 91 octane, based out of Oxnard, CA.
I have built boss block motor and longtubes. Currently with full exhaust ported eaton, stock upper and stock lower pulley set up my car is making 6psi. I guess I lost boost because of big bore motor and longtubes. I wounder if this blower and 4.25 will work with aje k-memeber and stock hood?