Product details

Description

Top feed EJs get the rail upgrade without the conversion hardware they never needed.

The Radium Engineering Subaru EJ Top Feed Fuel Rail Upgrade serves the cars already running top feed injectors: CNC machined aluminum high flow rails, anodized and laser etched, replacing the factory top feed rails on the supported 2004-2014 WRX and 2004-2021 STI applications with large internal bores and ORB porting. Unlike the side-feed conversion kits, this upgrade set assumes top feed from the factory, keeping the install a direct swap. All fuel types including E85. Injectors sold separately.

What You'll Feel

  • Fuel delivery headroom for big-turbo and E85 EJ builds
  • Even supply to all four injectors as boost and flow climb
  • ORB ports opening dampers, sensors, and the platform's plumbing kits
  • A direct swap on factory top feed cars, no conversion hardware

Features

  • Top feed fuel rail upgrade for supported EJ-platform WRX (2004-2014) and STI (2004-2021) models
  • CNC machined aluminum, anodized, laser etched; large internal bores; ORB porting
  • Upgrade rails: OEM or OEM-equivalent top feed injectors only (matching height and O-ring specs)
  • All fuel types including E85; injectors and plumbing sold separately

The Details

The EJ world splits by injector style, with early side-feed cars needing Radium's conversion kit (20-0568) while the top feed generations take this direct upgrade, and verifying which your car runs is the pre-order homework: side-feed conversion candidates are the 04-06 STI, 05-06 Legacy GT/Outback XT, and 04-05 Forester XT, with most other years top feed from the factory. Plumbing completes through Radium's EJ rail plumbing kits, series or parallel per the build (noting those kits' own fitment rules), and the injector rule is the standard, OEM-equivalent dimensions confirmed with the manufacturer.

Kit Includes

  • 2x Anodized, laser etched high flow top feed fuel rails with mounting hardware
  • Injectors and plumbing sold separately

Applications

  • 2004-2014 Subaru WRX and 2004-2021 STI with factory top feed injectors (verify injector style)
  • Side-feed cars use the Radium 20-0568 conversion kit instead