{"product_id":"subaru-oem-transmission-screw-union-oil-cooler-04-07-sti-21663aa010","title":"Subaru OEM Transmission Oil Cooler Union Screw STI 2004-2007 \/ Legacy GT 2007 | 21663AA010","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Genuine Subaru OEM Transmission Screw Union for Oil Cooler (Part #21663AA010) is an exact-fit factory replacement component designed specifically for 2004–2007 Subaru STI and 2007 Subaru Legacy GT models. This precision-engineered union ensures a leak-free connection within the transmission oil cooler circuit, maintaining optimal transmission fluid temperatures under the high-performance demands of the EJ257-powered STI. Choosing a genuine OEM part guarantees factory-spec fitment, material quality, and long-term reliability.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Subaru OEM Part\u003c\/strong\u003e – Manufactured to exact factory specifications, ensuring a perfect fit and eliminating the guesswork associated with aftermarket alternatives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak-Free Sealing\u003c\/strong\u003e – Precision-threaded screw union design provides a secure, oil-tight connection critical for maintaining proper transmission fluid flow and cooling performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Performance Application\u003c\/strong\u003e – Engineered for the demanding thermal and pressure environment of the 2004–2007 STI's transmission oil cooler system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Quality Materials\u003c\/strong\u003e – Built from the same materials used in original factory assembly, ensuring durability and resistance to transmission fluid degradation over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Warranty Coverage\u003c\/strong\u003e – As a genuine Subaru part, it is backed by Subaru's OEM parts warranty when purchased through an authorized source.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Replacement\u003c\/strong\u003e – No modifications required; installs exactly as the original component did from the factory.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Genuine Subaru Transmission Screw Union, Oil Cooler (Part #21663AA010)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSubaru Part Number\u003c\/th\u003e\n\u003ctd\u003e21663AA010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent Type\u003c\/th\u003e\n\u003ctd\u003eTransmission Oil Cooler Screw Union\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eGenuine OEM — New\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eTransmission Oil Cooler Circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Engine\u003c\/th\u003e\n\u003ctd\u003eEJ255 \/ EJ257 (2.5L Turbocharged Boxer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOEM \/ Aftermarket\u003c\/th\u003e\n\u003ctd\u003eOEM (Original Equipment Manufacturer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFitment \u0026amp; Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis genuine Subaru part is designed to fit the following vehicles:\u003c\/p\u003e\n\u003cp\u003e2007 Subaru Legacy GT\u003c\/p\u003e\n\u003cp\u003e2004-2007 Subaru STI\u003c\/p\u003e\n\u003cp\u003eAlways verify fitment against your vehicle's VIN and original part number before ordering. Cross-reference OEM part number \u003cstrong\u003e21663AA010\u003c\/strong\u003e to confirm compatibility.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eThis screw union is a direct OEM replacement for the transmission oil cooler circuit on 2004–2007 STI models. Installation involves accessing the transmission oil cooler line connections; it is recommended to drain the transmission fluid prior to replacement to prevent spillage. Torque to factory specifications as outlined in the Subaru service manual. While a mechanically experienced DIYer can complete this repair, professional installation by a qualified Subaru technician is recommended to ensure proper torque and leak-free sealing.\u003c\/p\u003e","brand":"Subaru OEM","offers":[{"title":"Default Title","offer_id":50513271455840,"sku":"sub21663AA010","price":25.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/Subaru-OEM-Transmission-Oil-Cooler-Union-Screw-STI-2004-2007-Legacy-GT-2007-21663AA010.png?v=1793218892","url":"https:\/\/www.importimageracing.com\/products\/subaru-oem-transmission-screw-union-oil-cooler-04-07-sti-21663aa010","provider":"Import Image Racing","version":"1.0","type":"link"}