Well the real reason for a return system is you could use a 1to1 fuel pressure regulator, per every psi of boost you'll get a psi of fuel pressure.
example big turbo SRT4:
at lets say 21psi of boost no return system with big injectors and fuel pump.
all you are doing is adding an huge amount of fuel since a 750 cc injectors is normally rated at 43psi not 58psi. if the car doesnt have a piggy back it will be pig rich. with a piggy back you'll have to take alot of fuel out which it will add timing which it means you'll make more power but it will NOT last long.. Detonation.
with a return system you'll be able to better tune the car for driveability as well as WOT, and not worry about taking out so much fuel out, since it will be there only when u need it WOT under boost.
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