{"product_id":"radium-engineering-top-feed-fuel-rail-upgrade-multiple-subaru-fitments-20-0567-02-479-02-372","title":"Radium Engineering Top Feed Fuel Rail Upgrade | 2001-2006 Subaru WRX \/ STI EDM\/JDM (20-0577-02)","description":"\u003cp\u003e\u003cstrong\u003eThe EJ's factory fuel rails were never sized for the injectors a built Subaru actually runs.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBig top feed injectors need a rail with volume and real ports behind them. The \u003cstrong\u003eRadium Engineering Top Feed Fuel Rail Upgrade\u003c\/strong\u003e for factory top feed EJ engines is a machined aluminum rail pair with three 8AN ORB threaded ports per rail, six total, ready for feed lines, a direct mount regulator, pulse dampers, or gauge adapters in whatever arrangement your system calls for. This is an upgrade rail, meaning your factory or OEM-equivalent injectors carry over. Thermal insulating spacers keep manifold heat out of the fuel. The rail your EJ fuel system should have started with.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Feel\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStable fuel delivery across all four injectors with volume the factory rails lack\u003c\/li\u003e\n\u003cli\u003eReal plumbing freedom, with six 8AN ORB ports to configure feed, return, damping, and monitoring\u003c\/li\u003e\n\u003cli\u003eCooler fuel from thermal insulating spacers isolating the rails from the hot intake manifold\u003c\/li\u003e\n\u003cli\u003eA straight swap using your existing factory-size injectors\u003c\/li\u003e\n\u003cli\u003eClean integration with Radium's Subaru parallel plumbing kits and regulators\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMachined aluminum fuel rails for Subaru EJ engines with factory top feed injectors\u003c\/li\u003e\n\u003cli\u003eThree 8AN ORB threaded ports per rail (six total) accepting Radium adapters, direct mount regulators, dampers, and gauge fittings\u003c\/li\u003e\n\u003cli\u003e20-0567-02: 8AN ORB port machined in the underside center of each rail\u003c\/li\u003e\n\u003cli\u003eUpgrade-style rail: compatible with factory or OEM-equivalent injectors (same height and O-ring dimensions)\u003c\/li\u003e\n\u003cli\u003eThermal insulating spacers included to limit intake manifold heat transfer\u003c\/li\u003e\n\u003cli\u003eOEM 2-bolt flange regulator reusable with Radium adapter 20-0303 (sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Details\u003c\/h3\u003e\n\u003cp\u003eRadium builds two families of Subaru rails, and knowing which you need saves a return. Upgrade rails, like this one, fit engines that already run top feed injectors from the factory and reuse OEM or OEM-equivalent injectors; conversion rails are for switching side feed or air-assist engines to top feed and are a different product. Injector selection follows one hard rule: same height and same upper and lower O-ring diameters as OEM, and Radium defers to your injector supplier and tuner for brand and flow specifics. One clearance note decides between the two variants of this rail: the center lower port bulge on the 20-0567-02 can interfere with the early AVCS solenoids on the EJ207 and JDM EJ205, and those engines should use the top-port 20-0577-02 instead, which shares identical mounting and injector spacing but relocates the third port to the top of each rail. Certain JDM STI and EJ253 applications running the 20-0577-02 also require the 20-0372 adapter set. Fittings, plumbing, and injectors are sold separately.\u003c\/p\u003e\n\u003ch3\u003eKit Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2x Machined aluminum top feed fuel rails (port location per selected variant)\u003c\/li\u003e\n\u003cli\u003eThermal insulating spacers and mounting hardware\u003c\/li\u003e\n\u003cli\u003eFittings, plumbing, and injectors NOT included, sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e20-0567-02: 2002-2014 Subaru Impreza WRX (USDM), 2007-2014 WRX (JDM\/EDM), 2007-2021 WRX STI, 2006-2013 Forester XT, 2001-2003 Legacy GT (JDM), 2007-2012 Legacy GT and Outback XT, 2005-2006 Saab 9-2X Aero\u003c\/li\u003e\n\u003cli\u003e20-0577-02 (top port): 2001-2006 Impreza WRX (JDM\/EDM), 2001-2006 WRX STI (EDM), 2001-2002 WRX STI (JDM); with 20-0372 adapters: 2003-2006 WRX STI (JDM), 2004-2011 Impreza EJ253, 2005-2010 Forester EJ253, 2005-2012 Legacy EJ253, 2006-2009 Outback EJ253\u003c\/li\u003e\n\u003cli\u003eFactory top feed EJ engines only; EJ207 and JDM EJ205 with early AVCS require the 20-0577-02 top-port variant\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Radium Engineering","offers":[{"title":"Top Feed Upgrade","offer_id":43672690425923,"sku":"20-0577-02","price":208.95,"currency_code":"USD","in_stock":true},{"title":"Fuel Rail Adapter for Version 8\/9 EJ207\/EJ253","offer_id":43672690458691,"sku":"20-0372","price":47.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/7754\/5539\/files\/maperformance-28360204943430_a7f7952f-0c4c-4615-a334-89a9324bb390.jpg?v=1786717064","url":"https:\/\/www.tunedbyshawn.com\/products\/radium-engineering-top-feed-fuel-rail-upgrade-multiple-subaru-fitments-20-0567-02-479-02-372","provider":"Tuned by Shawn","version":"1.0","type":"link"}