7.3 lift pump pressure?
#3
#4
Factory pressures are anywhere from 40 to 70 or so. You can shim the Fuel Pressure Regulator to what ever you would like, but anything over 70 and you risk blowing the fuel bowl cap off or fuel leaks and your over working the pump.
He does not have his IPR shimmed, he used to have his FPR shimmed but now is running an aftermarket fuel pressure regulator.
Raising the fuel pressure does nothing for performance so long as your pump is maintaining 50psi or better.
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