Hi Brad,
yup.. did exactly what you described with the MPS, and it worked great.. at least until i took the turbo pieces apart..
i was able to reach 14psi before the rubber plug on the intake manifold blew off.. i had pushed it on when i was FIRST testing the motor, and kinda forgot about it.. i was surprised that it held pressure up to 14psi!..
i agree that stock d-jet should be good up to 5psi.. i was able to run it at that with no problem at all.. but realistically, once you've built the turbo plumbing, etc.. who in their right mind is going to stay at 5psi, when you can buy a $20 hobbs switch, provide more fuel, and go up to 8psi?.. or spend $150 on a RRFPR, and go up to 14psi.. or.. be like me, plan for some 440CC injectors on custom rails, better fuel pump, and go up to 18psi?!.. it just never ends..
