its a dead head system ... no return lines. Kleeman claims the pump is good to double the stock standard Xf's rating (400 ft/lb) so the srt pump is not straining ...

i suggest against a rising rate fuel pressure regulator as volume goes down with increased pressure ... so you are fixing the problem of the injectors running out of pulsewidth and introducing a new one of lower the volume the fuel pump can dish out...

i also suggest against larger injectors cause you will be taking drivability away from the car as factory cold start settings and the like will not be supply the same flow of fuel at a particular pulsewidth as it thinks it is ... remapping the ECU for the new injectors is a wasteful pursuit at best due to the money involved...

my suggestion ? auxillary injector ... a extra 90 lb injector and holder can be placed at after the supercharger and before the throttle body ... auxillary injector driver (your choice, emanage, megasquirt, whatever) can be programmed to spray at MAP values beyond the stock systems capabilities ... the schrader valve on the fuel rails can be utilized as a nice neat 4AN fuel port for the injector. its clean, its reliable, its cheap ...