Porschefile, I run a Protomotive FPR & CHIP, 944Turbo injectors and twin 044 pumps (in series) in my Turbo'd Carrera. This setup requires the high fuel rail pressures to work, as it "over drives" the 944turbo injectors to flow enough for Stage 3 power levels (i.e: 550-600HP). Many tuners don't like to run such high fuel rail pressures as it puts a lot of strain on the EFI components, but it's been working fine for me for many years without any issues.
kupcar, you should really have two MATCHING fuel pumps, front & rear. I personally wouldn't run only one up in the rear, or in the front, unless you're running an aftermarket EFI with big injectors and need only the one big fuel pump.
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition