20-0577-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ, TOP PORT VEHICLE COMPATIBILITY01-06 Subaru Impreza WRX (JDM/EDM)01-06 Subaru Impreza WRX S Ti (EDM)01-02 Subaru Impreza WRX S Ti (JDM)The vehicles below also require 20-037203-06 Subaru Impreza WRX S Ti (JDM)04-11 Subaru Impreza (EJ253)05-10 Subaru Forester (EJ253)05-12 Subaru Legacy (EJ253)06-09 Subaru Outback (EJ253) FUEL INJECTOR COMPATIBILITY This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’. OVERVIEW These fuel rails have the same mounting, injector spacing and fitment as the 20-0567-02. 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). Instruction PDF