{"product_id":"manley-subaru-wrx-sti-490in-valve-spring-and-retainer-kit-w-o-valve-locks-16-each","title":"Manley Subaru WRX\/STi .490in Valve Spring and Retainer Kit (w\/o Valve Locks) (16 each)","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003e26185\u003c\/span\u003e | \u003cstrong\u003eUPC:\u003c\/strong\u003e 807298044774\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eManley Subaru WRX\/STI .490in Valve Spring and Retainer Kit (w\/o Valve Locks) (16 each) for 2002-2011 Impreza\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eUpgrade your Subaru EJ20 or EJ25 engine with the Manley .490in Valve Spring and Titanium Retainer Kit, a complete 16-piece set designed specifically for WRX and STI models. This kit fits 2002-2005 Impreza WRX and 2004-2011 Impreza WRX STI variants, enabling higher cam lift and sustained revs past 8000 RPM by preventing valve float and coil bind. Engineered for turbocharged DOHC applications, it delivers reliable power gains in racing or street use.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e.490in Maximum Lift:\u003c\/strong\u003e Handles aggressive cam profiles up to .490in lift with 1.100in coil bind height for safe high-RPM operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Spring Rates:\u003c\/strong\u003e Intake seat pressure 100 lbs at 1.670in, open 290 lbs at .490in lift. exhaust matched for balanced valvetrain control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitanium Retainers:\u003c\/strong\u003e Lightweight 10-degree retainers reduce reciprocating mass by 30% over steel, improving throttle response and durability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Dimensions:\u003c\/strong\u003e 1.200in OD \/ .875in ID springs made from high-tensile steel with progressive winding to minimize harmonics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete 16-Piece Kit:\u003c\/strong\u003e Covers all intake and exhaust valves on DOHC 2.0L\/2.5L EJ engines without locks for custom lock selection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eKit excludes valve locks. reuse OEM or pair with Manley 59029-16 locks for full assembly\u003c\/li\u003e\n\u003cli\u003eInspect retainers and springs during install for proper seating and shim requirements\u003c\/li\u003e\n\u003cli\u003ePackaged in protective sleeves. 4.1 lbs net weight, ships in 12x9x7in box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eRequires Subaru-specific valve spring compressor tool for safe removal and install\u003c\/li\u003e\n\u003cli\u003eCompatible with OEM keepers and seats. check valve stem clearance before final assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2005\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2011\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX STI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2007\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX STI Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX STI Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2010\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX STI Special Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose Manley?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDecades of motorsport dominance in valvetrain components for Subaru rally cars\u003c\/li\u003e\n\u003cli\u003eUSA-manufactured with XHRS or 9260 spring wire for fatigue resistance over 1 million cycles\u003c\/li\u003e\n\u003cli\u003eMagnetically particle inspected and load-tested for consistent performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Will this kit fit my 2006 WRX STI?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Yes, confirmed fit for all 2004-2011 Impreza WRX STI models with EJ255 engines. verify head casting for EJ25 turbo compatibility\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What material are the springs and retainers?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Springs use premium chrome-silicon high-tensile steel. retainers are forged 6AL4V titanium for strength-to-weight advantage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What is the warranty and install process?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Backed by Manley limited lifetime warranty against spring failure. install on engine stand with compressor tool, torque seals to spec\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground or FedEx - free over $99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock - ships same or next business day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Foam-protected in 12x9x7in corrugated box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.1 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":41147014250575,"sku":"MAN26185","price":532.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/products\/manley-subaru-wrxsti-_490in-valve-spring-and-retainer-kit-wo-valve-locks-16-each-manley-performance.jpg?v=1772547591","url":"https:\/\/www.blackopsautoworks.com\/products\/manley-subaru-wrx-sti-490in-valve-spring-and-retainer-kit-w-o-valve-locks-16-each","provider":"Black Ops Auto Works","version":"1.0","type":"link"}