Radium Fuel Rail Plumbing kit Parallel Setup

2002-2014 Subaru WRX / 2007+ Subaru STI

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SKU: 20-0584We price match!

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This is the Radium Engineering Parallel Fuel Rail Plumbing Kit. This plumbing kit has been designed to work with Radium Engineering's Subaru EJ fuel rail installations. This kit will interface with the factory feed and return hard lines in the engine bay near the LH strut tower and provides all of the underhood fuel plumbing. All necessary fittings and hoses are included along with an adjustable high-flow fuel pressure regulator.
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Radium Engineering Parallel Fuel Rail Plumbing Kit



  • Designed to work in conjunction with Radium Engineering's fuel rails
  • Compatible with Subaru platforms that use an EJ motor
  • Parallel in configuration
  • Because the hoses and fittings are consolidated, the parallel kit is a good option for cleaning up the engine bay
  • The feed and return lines enter the Radium Multi-Port Regulator from the rear and output through the front to the fuel rails
  • The regulator secures to the LH strut tower using the provided stainless steel mounting bracket 
  • A Radium 0-100 psi fuel pressure gauge is included for calibration 
  • Fittings and 6AN hose are included to interface with the OEM feed and return hard lines
  • If aftermarket -AN hoses and lines have replaced the factory piping, this kit can still be used



  • Does not include a fuel filter
  • Not compatible with Radium Engineering's Dual Port Injector Fuel Rail Kit 20-0499
  • Safe to use with alcohol fuels such as methanol, ethanol, and E85
  • This kit uses 3/8" (6AN) high-pressure EFI fuel hose
  • While a high-flow FPR is provided, the fuel system is still at mercy with the restrictive OEM venturi jet pump 
  • It is recommended to upgrade the OEM fuel pump unit
  • Because of the regulator mounting location and OEM fuel filter placement, the parallel fuel rail plumbing kit is only compatible with 2008+ Impreza WRX/STI and Forester models

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