Radium Top Feed Fuel Rail Upgrade 2002-2014 WRX/ 2007-2021 STI
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 insulating 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
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
These fuel rails have the same mounting and injector spacing as the 20-0579-02 (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)
-Thermal Insulating Press-In Spacers, 20mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)
20-0577-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ, TOP PORT
COMPATIBILITY
01-06 Subaru Impreza WRX (JDM/EDM)
01-06 Subaru Impreza WRX STi (EDM)
01-02 Subaru Impreza WRX STi (JDM)
The vehicles below also require 20-0372
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)
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)
-Thermal Insulating Press-In Spacers, 20mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)
20-0764-02 FUEL RAILS, SUBARU PHASE-I EZ30
COMPATIBILITY
00-04 Subaru Outback H6
00-03 Subaru Lancaster 6
02-03 Subaru Legacy GT30
02-03 Subaru Legacy RS30
2002 Subaru Blitzen 6 Wagon
These H-6 fuel rails are for the original Subaru EZ30 "Phase-I" flat 6 engine. This engine is denoted by having a single exhaust port per bank. These engines also incorporate the Subaru air-assist fuel injection system.
Each fuel rail has three 8AN ORB threaded ports (6 total). To reuse the OEM FPR, use 20-0301.
FUEL INJECTOR FITMENT
OEM Injectors-The Radium Engineering fuel rail features 11mm injector bores making it compatible with the factory Subaru EZ30 Phase-I "air-assist" fuel injectors. No modifications are needed. If preparing to use aftermarket fuel injectors, read below.
Aftermarket Injectors-The Phase-I EZ30 uses air-assist emissions equipment. These engines use a unique OEM fuel injector that is not replicated in the aftermarket. In order to use universal aftermarket fuel injectors, these cylinder heads require the provided Radium injector seats. When these injector seats are installed into the air-assist cylinder heads, an aftermarket injector that is 48mm long with 11mm upper O-ring and 14mm lower O-ring must be used. The following universal injectors have been verified to be compatible. However there are others on the market that will work that are not listed here.
Injector Dynamics ID1050-XDS-48-11-14
Injector Dynamics ID1300-XDS-48-11-14
Injector Dynamics ID1700-XDS-48-11-14
Injector Dynamics ID2600-XDS-48-11-14
Included
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Subaru Air Assist Injewctor Seats (x6)
-Thermal Insulating Press-In Spacers, 11mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x8)
20-0765-02 FUEL RAILS, SUBARU PHASE-II EZ30 AND EZ36
COMPATIBILITY
04-09 Subaru Legacy 3.0R
04-09 Subaru Outback 3.0R
10-19 Subaru Legacy 3.6R
10-19 Subaru Outback 3.6R
06-14 Subaru Tribeca
These H-6 fuel rails are for the EZ30 (Phase-II) and EZ36 flat 6 engines.
These fuel rails are compatible with AVCS.
As shown below, there is ample clearance with the nearby AVCS solenoid.
As shown below, each fuel rail has three 8AN ORB threaded ports (6 total). 
Included
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Thermal Insulating Press-In Spacers, 11mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)