I believe you ordered your setup with dual 525 pumps, which should definitely take care of the fuel supply that you'd need at that power level. On the feed side, 6AN is the safe bet. I designed the hanger to be expandable to 8AN, but that is mostly for future proofing the design. On the return, you can actually stay stock since there is a high-flow siphon that is built into the hanger that you will not outflow even with factory sized return line. Stock FPR has to go... The best aftermarket FRP on the market right now is the Radium [PN: 20-0528-01] FPR-D, Fuel Pressure Regulator-Damper. It combines FPR and damper into one compact unit and is built for all power levels. I have a wholesale account with them as well, so if you decide to go with it, I can get you a great deal on it. Let me know if you have any other questions.
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