97 auto 6 forward 4in exhaust age 1 torque tube
It's kind of cryptic,but I think he means he's using this valve:
TORK TEK CUMMINS ADJUSTABLE OVERFLOW VALVE OFV020 - Tork Teknology
And yes, it's pre set to 30-32 psi at the factory.
If it's 30 all the time I'd take that as your lp is pumping good volume.