The tuner?s choice for high horsepower EFI applications. The Pro-Series Regulator can support up to 2000 HP. For engines requiring high volume, high pressure fuel delivery, the Pro-Series Boost Reference EFI Regulator is a perfect fit for serious power. Adjustable base pressure from 30-75 PSI with the spring installed. Adjustable base pressure from 75-125 PSI with the optional spring included. Ideal for Pro-Series, Brushless 3.5 and Brushless 5.0 Electric Pumps using the 30-75 PSI spring. Suitable for 6-GPM mechanical pumps using both the standard and high pressure spring. Auxiliary ports available for nitrous applications, pressure gauges and transducers. References Vacuum/Boost on a 1:1 ratio. Includes two boost line adapters, one barbed for rubber hose, the other for AN-04 braided line (Prevents blow-off in high boost application s). Dedicated 1/8? NPT port. Includes Aeromotive?s radiused tapered flare fittings: (3) ORB-08 and (1) ORB-10 inlet ports, two with AN-08 flare adapters. (1) ORB-10 return port with AN-10 flare adapter port plugs included. Virtually indestructible electroless nickel-plating finish on the body with type II bright dip black anodized cap.