If the stated adjustability range is 35 psi to 65 psi is that only for idle or is that it.
I thout that most EFI systems ran around 45 psi of fuel pressure.
I will do some more research.
About 40psi. with hipo engines and turbo's you need more volume not pressure, that said the stock VW unit will work on all but the most extreme flat-4's.