Making Automotive Dreams a Reality. Mitsubishi Eclipse / Talon DSM. Mitsubishi Evo 8 / 9. Subaru BRZ / FR-S / GT-86. Radium Engineering Fuel Pressure Regulator Kit (BLACK) for 2008-17 SUBARU STI. 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 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. 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. Questions about this item? International Buyers – Please Note. We welcome your inquiry!