So far, it's supporting my 5.7 gen5 Whipple build up to 10psi, I'm going to be cranking up the boost soon. Going thru tuning now.
Upgraded 5.7L & 2.9 Whipple with BAP to forged 6.4L & 2.9 Whipple without BAP and added Walbro 525 pump in stock fuel assembly. The higher voltage BAP will run at the edge of the current for the stock fuel pump and 20A circuit. Although the 5.7 with stock internals can handle more boost than a stock 6.4, the 5.7 does not have forged internals. Boost above 10psi may be risky with stock rods & pistons. The stock fuel pump 68304617AA
is replaced with 68535771AA on 3.6, 5.7, 6.4. Don't think there is much difference. The stock relays are prone to failure and stock wiring is at limit and subject to voltage drops. Upgrade to 12GA wiring should be minimum but 10GA wire will reduce the voltage drop to the pump assembly and give upgradability to Walbro or dual pump. However, if upgrading to Walbro 525 or dual pumps, 8GA for the main run from battery, through fuse, upgraded relay and pigtails, and replacement of the power blue/pink wire and black ground wires to pump is recommended.