Fuel Pressure Regulator Kit - Green

• 2008–2021 Subaru | WRX STI

The Radium Engineering fuel pressure regulator kit in green for the 2008-2021 Subaru WRX STI 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 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 cycle through the engine's rails before reaching the regulator and returning to the tank, which is the preferred fuel line routing by Subaru tuners trying to address stumbling issues.

• Product type: Fuel pressure regulator kit
• Fitment: USDM 2008-2021 Subaru WRX STI (EJ257 only)
• Finish: Green
• The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference
• Interchangeable orifices allow the user to tune the regulator for any fuel pump flow
• The kit installs in the same location as the OEM fuel pressure regulator
• Vacuum hose and fittings are included to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal
• The optional pressure gauge kit 20-0386 can be installed into the unused 8AN ORB port on the regulator
• Part number: 20-0265-01

Q&A

• Does this fit my 2008-2021 Subaru WRX STI? Yes, if it is a USDM model with the EJ257 engine. This kit is designed for the USDM 2008-2021 Subaru WRX STI (EJ257 only).
• What is included in the box? The kit contains the fuel pressure regulator that replaces the OEM fuel pressure regulator and damper assembly, plus vacuum hose and fittings to re-route the vacuum reference line.
• How is it installed? The kit installs in the same location as the OEM fuel pressure regulator.

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