Radium Fuel Rails Top Feed Upgrade - Subaru EJ
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Appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.
Scroll to the bottom of this page to see details about the 20-0578 Fuel Rail Plumbing Kit.
Reference the chart below to be sure the proper fuel rails are ordered.
Manufactured with a large internal bore, the fuel rails can support all necessary engine power requirements. They are CNC machined from solid 6061 aluminum, black anodized, and laser etched for a high quality surface finish.
These fuel rails are designed specifically for OEM or equivalent fitment injectors. For injector height flexibility and thermal insulation, 2 sets of machined phenolic spacers are included. All injectors must use 11mm diameter upper O-rings just like the OEM Subaru injectors. Reference instruction manual for more information.
The fuel rails are compatible with all fuel types including popular alcohol mixtures such as E85.
20-0567-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ
These fuel rails have the same mounting and injector spacing as the 20-0479-02 (below). However, these fuel rails feature a 8AN ORB port machined in the underside center of each fuel rail.
NOTE: The center port bulge can create an interfere with early AVCS solenoids found in the EJ207 and JDM EJ205. If this is the case, use P/N: 20-0479-02 below.
Included:
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Phenolic Thermal Insulating Press-In Spacers, 20mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)
20-0479-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ, TOP PORT
These fuel rails have the same mounting, injector spacing and fitment as the 20-0567-02 (above). However, each fuel rail has an 8AN ORB "top port", unlike 20-0567-02 which has a center lower port (picture below shown with Fuel Rail Adapter 20-0372). 
The added clearance is necessary for the EJ207 and JDM EJ205 engines that have early AVCS solenoids with vertical connectors (shown below).
Included:
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Phenolic Thermal Insulating Press-In Spacers, 20mm (x4)
-Phenolic Thermal Insulating Press-In Spacers, 15mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)
20-0372 Fuel Rail Adapter, Ver8/9 EJ207, 2.5i EJ253
For more information and installation instructions regarding the 20-0372 Fuel Rail Adapter, Ver8/9 EJ207, 2.5i EJ253, go HERE.
20-0578 Subaru Fuel Rail Plumbing Kit for EJ Engines
For more information and installation instructions regarding the 20-0578 Subaru EJ Fuel Rail Plumbing Kit, go HERE.
