This kit is designed for use in the USDM 2008-2017 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly, shown below. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand.

The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator, and returning to the tank. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues.

The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow.

For more information on the Radium Fuel Pressure Regulator, CLICK HERE. The 20-0029 Pressure Gauge (shown below) is sold separately HERE and requires adapter fittings 14-0119 and 14-0332 to work.

The kit installs in the same location as the OEM fuel pressure regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a stable vacuum signal.

Selectable regulator top colors are available in green or black (green shown above).