You only need one fpr & it will have to be an aftermarket one like Sard, SX, Fuelab, Aeromotive e.t.c. which will be only be fitted after the fuel rails on the return to the tank (i.e: the fpr will ensure the pressure behind it is kept constant at whatever you want it to be - 3bar is stock if I remember right).
The 2 fuel rails can then be fed separately, or linked together, into the fpr (depends if you have one or two inlets into the fpr). Then the fpr outlet goes back to the tank as normal.
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