The GT500 kit from Ford (M-9407-GT05) also includes the additional FPDM (Fuel Pump Driver Module) and additional wiring for power. Installing just the GT500 pumps without the driver module and wiring would cause issues.
I'd again suggest a tune from JDM Engineering. The Ford kit says that tuning is required, not optional.
My explanation...
I don't like BAP's because they increase the voltage beyond what the pump was designed for. The internal components of the fuel pump motor were not designed for 17 - 18 volts. Just my opinion that when you drive something beyond its design limits, particularly electronics, you are asking for trouble. Plus, increasing the rail pressure by increasing the pump voltage is a crude and imprecise way to increase fuel delivery. Not to mention the extra strain on fuel system parts (filters, pressure sensor, injector components) from increased pressure it was never designed for (again makes me hesitant on BAP's)
Properly sized injectors with the proper pulse width, rail pressure, and fueling strategy are superior for driveability in my opinion.
I know that tons of people use BAP's without issue... I'm just more inclined to buy the correctly sized components than use "trickery" or a band-aid device for the fuel system.
What I do like about a BAP is their voltage regulation. Maintaing a steady ~14.3 volts to the pump(s) regardless of whether the lights are on or off, the stereo is cranking, the a/c is blowing, windows are being rolled up and down, etc... Is a great idea.
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