Performance EFI regulators designed for medium to high horsepower applications. Both regulators feature Aeromotive's high-flow design, superb pressure control and legendary durability. On the street and at the track, these pressure regulators have logged more miles, laps and passes than any other performance EFI regulators in the world! Base pressure adjustable from 40-75 PSI. Gasoline and alcohol compatible. Fuel pressure rises on a 1:1 ratio with boost. 1/8" NPT gauge port. P/N 13101 provides (2) ORB-10 inlet ports and (1) ORB-06 return port. P/N 13109 provides (2) ORB-06 inlet ports and (1) ORB-06 return port.