Radium FPR RA Fuel Pressure Regulator KitThis kit is designed for use in the USDM 08 21 Subaru WRX STi (EJ257 only). 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. Fuel is only routed to the engine when there is demand. The Radium FPR kit re routes fuel to cycle through the fuel rails before reaching the regulator and returning to the
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