I know Stock USDM fue1 Pressure us 47-53psi, but when I had swapped to a JDM ITR motor the fuel pressure PSI was about 58 psi with the line off........This might have been fine on a stock JDM ITR ECu but im using Kenji's ecu and I know it runs super rich...any opinions, of course this would be much easier if I had a dyno within distance

 

You could swap back to your USDM regulator, its just two 10mm bolts and hoses.