![]() 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. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow. 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. 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 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. Radium Engineering Fluid Lock Catch Can Kit 2008-2015 Mitsubishi Evolution X (20-0105FL) 41 Reviews. Fuel is only routed to the engine when there is demand. Radium Engineering Clutch Fork Stop Multiple Evo Fitments (20-0262) 59 Reviews. ![]() 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. 2008+ STi Fuel Pressure Regulator Kit by Radium In depth tutorial on how to install the radium fuel pressure regulator (FPR) Kit on the 08-2017 Subaru WRX STi.
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