Kenne Bell made it clear that help from Jerry Wroblewski and SCT software, as well as DiabloSport's MAFia mass air extender were necessary to provide the electronic support the fuel upgrade kit requires. The MAFia is required past 700 rwhp since the stock mass air electronics are pegged at that point, and increased fuel pressure can't be accurately accounted for by the engine computer.
The D'Agostino fuel system upgrade surpasses even that trick's usefulness, so a DiabloSport MAFia mass air extender is required to tune higher yet. Kenne Bell was just able to avoid having to fit the $150 MAFia to the Mammoth kit, but it is a must when stepping up with the fuel upgrade, so it's included.
Summing up the situation, we see the two fuel systems potentials:
Mammoth:/
Two stock Cobra fuel pumps at 119 lph (20 psi) w/BAP = 378 lph for 704 rwhp
Fuel Upgrade: Two Ford GT fuel pumps at 212 lph (20 psi) w/BAP = 600 lph for 1,100 rwhp
Clearly the D'Agostino fuel upgrade kit quells any normal questions regarding fuel delivery. Just as clearly, it's something for high-achieving, more than 700-rwhp Cobras and isn't necessary for strictly street cars.