QUIET external low-pressure electric fuel pump?

With or without a return line? Without a return your choices are limited.

With return line I use a Walbro GSL-392 High pressure pump with a Mallory 1407M Return style regulator. Pump is super quiet and fuel pressure is dead solid and does not move at 6.5 PSI. Good for an easy 600whp in a Natural Aspirated application.