Radium Engineering 08-17 Subaru WRX STI Fuel Pressure Gauge w/ 8AN ORB Adapter

For a properly planned performance build, the Radium Engineering 08-17 Subaru WRX STI Fuel Pressure Gauge w/ 8AN ORB Adapter controls EFI fuel pressure and returns excess fuel so injectors see a stable, tunable pressure supply. Radium regulators are intended for performance return-style systems where consistent pressure control is important as fuel demand and manifold pressure change.

For 08-17 Subaru WRX STI, it is intended to integrate with the vehicle-specific layout rather than serve as a universal substitute. Key sizing for this version includes 8AN ORB AN/ORB sizing, so it should be matched to the rest of the system before installation. A fuel return must be routed back to the tank or surge tank. Match regulator port sizes and pressure range to the fuel-system design.