Description

COMPATIBILITY

See the details below for individual compatibility.

OVERVIEW

Radium fuel rails for EJ engines come in two styles. The top feed conversion rails fit OEM side feed manifolds and convert from side feed injectors to universal top feed injectors. The top feed upgrade rail kits install onto manifolds that are factory equipped with top feed injectors and are simply an upgrade of the rail, still accepting the OEM fuel injector.

Before ordering, make sure that you've matched your intake manifold by model to the correct fuel rail part number and closely follow the fuel injector compatibility information of that fuel rail below to ensure that you order the correct parts.

PORTS AND FITTINGS

The fuel rail ports are tapped for 8AN ORB fittings.

8AN ORB Adapter Fittings can be found HERE
8AN ORB Direct Mount Regulators can be found HERE
8AN ORB Fuel Pulse Dampers can be found HERE
Fuel Pressure Gauge Adapters can be found HERE

Want a complete engine bay plumbing kit that includes regulator, lines and fittings? Click HERE. 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.

	20-0567-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ OVERVIEW These fuel rails have the same mounting and injector spacing as the 20-0577-02. However, these fuel rails feature a 8AN ORB port machined in the underside center of each fuel rail, as shown below. 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: 20-0577-02 instead. COMPATIBILITY 02-14 Subaru Impreza WRX (USDM) 07-14 Subaru Impreza WRX (JDM/EDM) 07-21 Subaru Impreza WRX STi 06-13 Subaru Forester XT 01-03 Subaru Legacy GT (JDM) 07-12 Subaru Legacy GT 07-12 Subaru Outback XT 05-06 Saab 9-2X Aero FUEL INJECTOR COMPATIBILITY This fuel rail is compatible with factory or OEM equivalent fuel injectors. The machined injector ports are designed for 11mm upper injector O-rings. This means that the injectors being installed must match the OEM height and o-ring dimensions. If installing aftermarket fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating "OEM equivalent". INCLUDES Black Anodized Laser Etched Aluminum Fuel Rails Thermal Insulating Press-In Spacers, 20mm Stainless Steel Mounting Hardware
	20-0568-02 FUEL RAILS, TOP FEED CONVERSION, SUBARU EJ OVERVIEW Each fuel rail features three 8AN ORB threaded ports (6 total). Press-fit spacers are included to thermally insulate intake manifold heat transfer. Conversion fuel rails convert the OEM side feed fuel injector setup to top feed allowing the use of high flow fuel injectors. The fuel rail injector bores are 14mm ID. 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 engraved for a high quality surface finish. The fuel rails are compatible with all fuel types including popular alcohol mixtures such as E85. The four billet injector seats are anodized and laser etched and provide a sealed receptacle for top feed fuel injectors. The seats are designed for injectors with 14mm lower O-rings. COMPATIBILITY 04-06 Subaru WRX STi (USDM) 04-05 Subaru Forester XT 05-06 Subaru Legacy GT 04-06 Subaru Legacy GT (JDM) 05-06 Subaru Outback XT FUEL INJECTOR COMPATIBILITY Do NOT purchase 'WRX Fitment' injectors. Injectors must have 14mm O-rings top and bottom and must match the 34mm height dimensions shown below. Many injector manufacturers will have applications with these dimensions. Here are a few examples of applicable injector part number from Injector Dynamics: Injector Dynamics ID1050-XDS-34-14-14 Injector Dynamics ID1300-XDS-34-14-14 Injector Dynamics ID1700-XDS-34-14-14 Injector Dynamics ID2600-XDS-34-14-14 Fuel Injectors are NOT included and must be purchased elsewhere. INCLUDES Black Anodized Laser Etched Aluminum Fuel Rails Green Anodized and Laser Etched 22mm Injector Seats Thermal Insulating Press-In Spacers, 15mm Stainless Steel Mounting Hardware
	20-0569-02 FUEL RAILS, TOP FEED CONVERSION, SUBARU EJ V3-6 OVERVIEW For the 20-0569-02 conversion fuel rails, adaptable mounting brackets are included that permits a wide range of Subaru vehicles to be used. Each fuel rail features three 8AN ORB threaded ports (6 total). Press-fit spacers are included to thermally insulate intake manifold heat transfer. COMPATIBILITY 97-00 Subaru Impreza WRX (JDM/EDM) 97-00 Subaru Impreza WRX STi (JDM) 98-01 Subaru Forester (JDM, EJ20G) 92-00 Subaru Legacy GT (JDM, EJ20G) FUEL INJECTOR COMPATIBILITY Do NOT purchase 'WRX Fitment' injectors. Injectors must have 14mm O-rings top and bottom and must match the 48mm height dimensions shown below. Many injector manufacturers will have applications with these dimensions. Here are a few examples of applicable injector part number from Injector Dynamics: Injector Dynamics ID1050-XDS-48-14-14 Injector Dynamics ID1300-XDS-48-14-14 Injector Dynamics ID1700-XDS-48-14-14 Injector Dynamics ID2600-XDS-48-14-14 Fuel Injectors are NOT included and must be purchased elsewhere. INCLUDES Black Anodized Laser Etched Aluminum Fuel Rails Black Anodized Version 3-6 Conversion Fuel Rail Mount Black Anodized and Laser Etched 26mm Injector Seats Thermal Insulating Press-In Spacers Stainless Steel Mounting Hardware
	20-0577-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ, TOP PORT OVERVIEW 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). COMPATIBILITY 01-06 Subaru Impreza WRX (JDM/EDM) 01-06 Subaru Impreza WRX STi (EDM) 01-02 Subaru Impreza WRX STi (JDM) 03-06 Subaru Impreza WRX STi (JDM)⁽¹⁾ 04-11 Subaru Impreza (EJ253)⁽¹⁾ 05-10 Subaru Forester (EJ253)⁽¹⁾ 05-12 Subaru Legacy (EJ253)⁽¹⁾ 06-09 Subaru Outback (EJ253)⁽¹⁾ ⁽¹⁾The vehicles below also require part number 20-0372 adapter kit. FUEL INJECTOR COMPATIBILITY This fuel rail is compatible with factory or OEM equivalent fuel injectors. The machined injector ports are designed for 11mm upper injector O-rings. This means that the injectors being installed must match the OEM height and o-ring dimensions. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating "OEM equivalent". INCLUDES Black Anodized Laser Etched Aluminum Fuel Rails Thermal Insulating Press-In Spacers, 20mm Stainless Steel Mounting Hardware
	20-0579-02 FUEL RAILS, TOP FEED CONVERSION, SUBARU EJ V1-2 OVERVIEW For the 20-0579-02 conversion fuel rails, mounting brackets are included that permit a wide range of Subaru vehicles to be used. Each fuel rail features three 8AN ORB threaded ports (6 total). Press-fit spacers are included to thermally insulate intake manifold heat transfer. COMPATIBILITY 98-99 Subaru Legacy SUS (EJ25D) 96-97 Subaru Legacy LSi (EJ25D) 96-99 Subaru Legacy GT (EJ25D) 94-98 Subaru Legacy (JDM, EJ25D) 94-98 Subaru Grand Wagon (JDM, EJ25D) 94-98 Subaru Lancaster (JDM, EJ25D) 96-99 Subaru Outback (EJ25D) 92-96 Subaru Impreza WRX (EJ20G) 1998 Subaru Impreza 2.5RS (EJ25D) 1998 Subaru Forester (EJ25D) FUEL INJECTOR COMPATIBILITY Do NOT purchase 'WRX Fitment' injectors. Injectors must have 14mm O-rings top and bottom and must match the 34mm height dimensions shown below. Many injector manufacturers will have applications with these dimensions. Here are a few examples of applicable injector part number from Injector Dynamics: Injector Dynamics ID1050-XDS-34-14-14 Injector Dynamics ID1300-XDS-34-14-14 Injector Dynamics ID1700-XDS-34-14-14 Injector Dynamics ID2600-XDS-34-14-14 Fuel Injectors are NOT included and must be purchased elsewhere. INCLUDES Black Anodized Laser Etched Aluminum Fuel Rails Black Anodized Version 1-2 Conversion Fuel Rail Mount Black Anodized and Laser Etched 26mm Injector Seats Thermal Insulating Press-In Spacers Stainless Steel Mounting Hardware
	20-0869-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ22/EJ251 OVERVIEW As shown below, thermal insulating spacers are provided to protect from heat transfer. Each fuel rail has three 8AN ORB threaded ports (6 total). If the OEM fuel pressure regulator needs to be reused, 20-0303 can be used. A Radium Engineering 20-0776 fuel pulse damper can be installed into the center port. COMPATIBILITY 1999 Subaru Impreza 2.2L (CARB)⁽²⁾ 99-01 Subaru Impreza 2.2L (FED) 99-04 Subaru Impreza 2.5RS 99-04 Subaru Impreza 2.5TS 99-04 Subaru Impreza 2.5OBS 99-04 Subaru Forester 1999 Subaru Legacy 2.2L (CARB)⁽²⁾ 1999 Subaru Legacy 2.2L (FED) 00-04 Subaru Legacy 2.5L 00-04 Subaru Outback 03-05 Subaru Baja ⁽²⁾Not compatible with OEM top feed injectors. The following is also required: 20-0816 (x4), 14-0720 (x4), Flat Head M8x1.25x60mm Screws (x4) FUEL INJECTOR COMPATIBILITY This fuel rail is compatible with the OEM air assist fuel injectors found on the EJ251. However, it is not compatible with the OEM air assist fuel injectors found on the EJ22 as they use 11mm upper injector O-rings. The machined injector ports are designed for 14mm upper injector O-rings. The fuel rails are compatible with 48mm tall Bosch EV14 injectors. Compatible aftermarket injectors must have 14mm upper and lower O-rings. Many injector manufacturers will have applications with these dimensions. Here are a few examples of applicable injector part number from Injector Dynamics: Injector Dynamics ID1050-XDS-34-14-14 Injector Dynamics ID1300-XDS-34-14-14 Injector Dynamics ID1700-XDS-34-14-14 Injector Dynamics ID2600-XDS-34-14-14 Fuel Injectors are NOT included and must be purchased elsewhere. To eliminate the Subaru air assist feature on the EJ251, the provided O-rings should be installed into the lower groove on the Bosch EV14 injectors. To eliminate the Subaru air assist feature on the EJ22 (California spec only), 20-0816 (x4) injector seats as well as 14-0720 (x4) spacers, and flat head M8x1.25x60mm Screws (x4) are required. INCLUDED Black Anodized Laser Etched Aluminum Fuel Rails Green Anodized Fuel Rail Mount Black Anodized and Laser Etched 26mm Injector Seats Thermal Insulating Press-In Spacers Rubber Mounting Spacer Stays FKM O-rings For Aftermarket Injectors Stainless Steel Fuel Rail Hardware Stainless Steel Mount Hardware
	20-0372 Fuel Rail Adapter, Ver8/9 EJ207, 99-09 EJ253, and EJ259 These adapters are required when installing top feed upgrade rail 20-0577-02 on the following vehicles: 03-06 Subaru Impreza WRX STi (JDM) 04-11 Subaru Impreza (EJ253) 05-10 Subaru Forester (EJ253) 05-12 Subaru Legacy (EJ253) 06-09 Subaru Outback (EJ253) For more information and installation instructions regarding the 20-0372, go HERE.