That's not an FPR on the fuel rail. You also only have one line on that fuel rail. So yes, you need the C5 fuel filter to both regulate the pressure and provide a return to the tank. I can't help with your other questions, sorry.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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