{"product_id":"manley-subaru-wrx-sti-16pc-valve-springs-1-050-755-for-use-with-23180-16-retainers","title":"Manley Valve Springs (1.050\/.755, 16pc, for 23180-16 Retainers) - 2002-2012 Subaru WRX \/ 2004-2012 Subaru STI","description":"\u003cul\u003e\n\u003cli\u003eValve spring set, 1.050\/.755 dimensions, 16 pieces\u003c\/li\u003e\n\u003cli\u003eMatched specifically to 23180-16 retainers\u003c\/li\u003e\n\u003cli\u003eIncreased seat and open pressure over factory springs\u003c\/li\u003e\n\u003cli\u003eSupports higher lift camshafts and higher RPM\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eA Spring Built to Match a Specific Retainer\u003c\/h3\u003e\n\u003cp\u003eThis Manley valve spring set is dimensioned at 1.050\/.755 specifically to work with Manley's 23180-16 retainers, ensuring correct installed height and spring binding clearance rather than guessing at compatibility between mismatched brands. Upgrading valve springs becomes necessary once you've installed a higher lift or longer duration camshaft, since factory springs often can't provide enough seat pressure to control the valve at the more aggressive lift and RPM those cams introduce. Getting the spring and retainer combination correct is critical to avoiding valve float or spring coil bind. It's the kind of upgrade that quietly does its job without ever needing a second thought.\u003c\/p\u003e\n\n\u003ch3\u003eA Full Set of 16 for a Complete Engine\u003c\/h3\u003e\n\u003cp\u003eThis set includes all 16 springs needed for a complete EJ20\/EJ25-based engine, rather than requiring you to piece together individual springs and hope they're consistent. Matched springs across all cylinders is what keeps valve behavior consistent engine-wide rather than having one cylinder behave differently than the rest. It's the correct spring choice specifically when paired with Manley's matching 23180-16 retainer part number. That's real, functional engineering, not just a marketing claim.\u003c\/p\u003e\n\n\u003ch3\u003eStraight From Subispeed\u003c\/h3\u003e\n\u003cp\u003eThe correctly matched valve spring set for 2002-2012 WRX \/ 2004-2012 STI when paired with Manley's 23180-16 retainers — confirm your retainer part number before ordering.\u003c\/p\u003e\n\n\u003cp\u003eThis Part Fits:\u003c\/p\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2012\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eWRX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2012\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eSTI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":53062413320481,"sku":"MAN22180-16","price":131.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/9029\/2257\/files\/c56f481391b2f4290581d7af33c85e92L.jpg?v=1784694880","url":"https:\/\/www.subispeed.com\/products\/manley-subaru-wrx-sti-16pc-valve-springs-1-050-755-for-use-with-23180-16-retainers","provider":"SubiSpeed","version":"1.0","type":"link"}