Radium RA-Series FPR Fuel Pressure Regulator Kit for Subaru STI 08-21 EJ257. This 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 […]
Radium FPR Fuel Pressure Regulator Kit BLACK for Subaru STI 08-21 EJ257. 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 replaces the factory regulator and re-routes fuel to […]
Perrin Adjustable Fuel Pressure Regulator Black For STI 08-19 EJ257 PSP-FUL-301. The PERRIN Fuel Pressure Regulator is designed with adjustability and high-flow fuel regulation in mind that works with fuel systems ranging from stock setups to 1000+ horsepower setups and the best option to fix the stumbling issue present in vehicles. HIGH-FLOW Of the (6) […]
Radium FPR Fuel Pressure Regulator Kit Green for Subaru STI 08-19 EJ257. 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 replaces the factory regulator and re-routes fuel to […]