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. Product Description RAD20-0265-01 The Fuel Pressure Regulator Kit will come in a green finish to improve the fuel pressure adjustments in the Subaru WRX/STI. The kit installs in the same location as the OEM fuel pressure regulator. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow. This kit is designed for use in the USDM 2008 - 2021 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly. The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. 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. Fuel is only routed to the engine when there is demand. Large filter socks, which have a rigid internal skeleton insert are not recommended because they cannot fit inside the collector box. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. NOTE: The Radium fuel pump hanger was designed for a specific type of fuel pump sock filter. 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. 2008+ STi Fuel Pressure Regulator Kit by Radium
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