Fuel pressure regularor

Does an aftermarket fuel pressure regulator (like the RIVA one) give any improvement without upgrading the injectors, so using oem injectors? I read somewhere than stock regulator sometime is not accurate, should be 58 but on some jet Is much less, any experience about? Thanks

when you upgrade boost of supercharger, you need more fuel , ie bigger injectors, upgrade fuel pump and pressure reg , are just the start.