Click here to download installation instructions (PDF)

These plumbing kits are designed to compliment Radium Engineering Subaru EJ fuel rail installations. Both kits interface with the factory feed and return hard lines in the engine bay (near the LH strut tower) and provide all the underhood fuel plumbing. All necessary fittings and hoses are included, along with an adjustable high-flow fuel pressure regulator. 
Two kits are offered; this kit feeds the fuel rails in series, another that feed the fuel rails in a parallel configuration is available as well with PN 20-0584. Both kits perform equally well. The end decision is based on personal preference. 

Both kits are compatible with all Radium Fuel Rails for the Subaru EJ engines (excluding Fuel Rails).

1. Neither kit includes a fuel filter.
2. Neither kit is compatible with Radium dual port injector fuel rail kit 20-0499.
3. Both kits are safe to use with alcohol fuels such as methanol, ethanol, E85 etc.
4. Both kits use 3/8" (6AN) high pressure EFI fuel hose.

This kit is compatible with Subaru platforms that use an EJ motor. For early vehicles with an engine bay mounted fuel filter, consult the installation instructions.

This kit interfaces with the factory hard lines near the LH strut tower using SAE quick connects or older hose barb connections. An adjustable Radium Direct Mount Regulator (DMR) and Radium 0-100psi fuel pressure gauge are included. The fuel pressure gauge can be installed at any of the 6AN junctions before the regulator using the included adapter. The 6AN swivel fuel rail fittings are low profile making them ideal for the tight spaces associated with the EJ motor. The variety of reuseable PushLok hose ends permit customizing (such as adding a flex fuel sensor) making installation quick and painless. The included 6AN fuel hose can be cut with standard tools and assembled without special skills. Unlike standard low-quality rubber fuel hose that degrades with alternate fuels, the provided hose is resistant to all fuels including E85.
The contents of the 20-0578 kit are shown in the photo below.

Fits all STI's 92-2021, WRX 92-2014, all Foresters, Legacy's, S-GT, Exiga with EJ20 or EJ25 engines. 


Radium Engineering direct fit plumbing kit including Direct Mount Fuelpressure regulator, lines and fittings for EJ equipped Subaru's. 

SKU 20-0578
Brand Radium Engineering
Shipping Weight 3.0000kg
Shipping Width 0.400m
Shipping Height 0.200m
Shipping Length 0.400m
Shipping Cubic 0.032000000m3

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