Depending on the vehicle's country of origin, this fuel rail conversion kit is compatible with the following OEM side feed TGVs (tumble generator valves) that came with the following Subaru models:
2004-2006 Impreza WRX STi (that came with side feed injectors)
2005-2006 Legacy GT (that came with side feed injectors)
2005-2006 Outback XT (that came with side feed injectors)
2004-2005 Forester XT (that came with side feed injectors)
This fuel rail kit converts the OEM side feed fuel injector setup to top feed, allowing the use of high flow fuel injectors (not included). The fuel rail injector bores are 14mm ID. Each rail features a large internal bore to suit even the most fuel hungry engines. They are CNC machined from solid 6061 aluminum, black anodized, and laser engraved for a high quality surface finish. All 3 ports on each fuel rail are tapped with 8AN ORB (3/4"-16) threads
Machined phenolic mounting spacers and washers are included to completely isolate the fuel rail from heat transferred from the TGV housings and mounting bolts.
KIT INCLUDES:
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Green Anodized and Laser Etched Injector Seats (x4)
-Phenolic Thermal Insulating Press-In Spacers, Tall (x4)
-Phenolic Thermal Insulating Press-In Spacers, Short (x4)
-Phenolic Thermal Insulating Press-In Bolt Washers (x4)
-Stainless Steel M8x1.25 Mounting Bolts, Long (x4)
-Stainless Steel M8x1.25 Mounting Bolts, Short (x4)
-Black Anodized Aluminum 6AN Male Fittings (x4)
-Black Anodized Aluminum 8AN ORB Plugs (x4)
Do I need a pulse damper?
The opening and closing of the injectors creates pressure pulses in the fuel rail, which can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure, a pulse damper should be used (especially with high flow injectors). The internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help an erratic surging idle. 
The optional Radium 20-0176 fuel pulse damper can be used in any of the three -8AN ORB ports on the Subaru fuel rails.