{"product_id":"ferrea-subaru-sti-dual-special-alloy-valve-spring-set-of-16","title":"Ferrea Dual Special Alloy Valve Spring - 04-21 Subaru WRX STI EJ257 - Set of 16 - S10097","description":"\u003cdiv class=\"wheel_category_landing_page_header\"\u003e\n\u003cp id=\"catdesc\"\u003eThe design and processes on these dual valve springs are optimized to reduce valvetrain harmonics and provide greater stability on high horsepower applications. We use high grade premium super-clean PAC alloy materials and maintain tight tolerances for those unique aftermarket cylinder heads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eType\/Material\/Application: Dual Spring - Special Alloy - Turbo - Drag Racing\u003cbr\u003eOutside Diameter: 20.8 mm\/28 mm\u003cbr\u003eInside Diameter: 15.88mm\/20.8mm\u003cbr\u003eSeat Press:. 90lbs@36 mm\u003cbr\u003eOpen Press: 215 lbs@26 mm\u003cbr\u003eRate Inch: 317lbs\u003cbr\u003eCoil Bind: 21.5 mm\u003cbr\u003eMax Lift: 14 mm\u003cbr\u003eThis Spring requires Ferrea Titanium Retainer # E11065 and Ferrea Spring Seat Locator # SL1051 (Discard OEM Spring Seat Locator)\u003c\/p\u003e\n\u003cp\u003eFitment:\u003cbr\u003e2004:Subaru:Impreza:WRX STI, \u003cbr\u003e2005:Subaru:Impreza:WRX STI, \u003cbr\u003e2006:Subaru:Impreza:WRX STI, \u003cbr\u003e2007:Subaru:Impreza:WRX STI, \u003cbr\u003e2007:Subaru:Impreza:WRX STI Limited, \u003cbr\u003e2008:Subaru:Impreza:WRX STI, \u003cbr\u003e2009:Subaru:Impreza:WRX STI, \u003cbr\u003e2010:Subaru:Impreza:WRX STI, \u003cbr\u003e2010:Subaru:Impreza:WRX STI Special Edition, \u003cbr\u003e2011:Subaru:Impreza:WRX STI, \u003cbr\u003e2011:Subaru:Impreza:WRX STI Limited, \u003cbr\u003e2012:Subaru:Impreza:WRX STI, \u003cbr\u003e2012:Subaru:Impreza:WRX STI Limited, \u003cbr\u003e2013:Subaru:Impreza:WRX STI, \u003cbr\u003e2013:Subaru:Impreza:WRX STI Limited, \u003cbr\u003e2014:Subaru:Impreza:WRX STI, \u003cbr\u003e2014:Subaru:Impreza:WRX STI Limited, \u003cbr\u003e2015:Subaru:WRX STI:Base, \u003cbr\u003e2015:Subaru:WRX STI:Launch Edition, \u003cbr\u003e2015:Subaru:WRX STI:Limited, \u003cbr\u003e2016:Subaru:WRX STI:Base, \u003cbr\u003e2016:Subaru:WRX STI:Limited, \u003cbr\u003e2016:Subaru:WRX STI:Series.HyperBlue, \u003cbr\u003e2017:Subaru:WRX STI:Base, \u003cbr\u003e2017:Subaru:WRX STI:Limited, \u003cbr\u003e2018:Subaru:WRX STI:Base, \u003cbr\u003e2018:Subaru:WRX STI:Limited, \u003cbr\u003e2018:Subaru:WRX STI:Type RA, \u003cbr\u003e2019:Subaru:WRX STI:Base, \u003cbr\u003e2019:Subaru:WRX STI:Limited, \u003cbr\u003e2019:Subaru:WRX STI:S209, \u003cbr\u003e2020:Subaru:WRX STI:Base, \u003cbr\u003e2020:Subaru:WRX STI:Limited, \u003cbr\u003e2021:Subaru:WRX STI:Base, \u003cbr\u003e2021:Subaru:WRX STI:Limited, \u003c\/p\u003e","brand":"Ferrea","offers":[{"title":"Default Title","offer_id":49998547812632,"sku":"FERS10097","price":485.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0259\/7856\/8790\/files\/60fdb8afc2bfdcd94d20de6df46b00d0_de63a943-161e-4666-8467-d0cb6a164355.jpg?v=1745719764","url":"https:\/\/nipponpower.com\/products\/ferrea-subaru-sti-dual-special-alloy-valve-spring-set-of-16","provider":"Nippon Power","version":"1.0","type":"link"}