Fuel is only routed to the engine when there is demand. It 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. 20-0577-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ, TOP PORT. The optional pressure guage kit 20-0386 can be installed into the unused 8AN ORB port on the regulator, as shown above 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 more stable vacuum signal. The kit installs in the same location as the OEM fuel pressure regulator. 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. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. 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. The stock system will supply enough fuel pressure for 17-18 psi if the fuel pump is up to the task. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. 2008+ STi Fuel Pressure Regulator Kit by Radium. The stock fuel pressure is 43 psi but the OEM regulator is manifold pressure compensated so it will raise the fuel pressure on a 1:1 ratio to increasing boost. Radium engineering 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.
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