{"product_id":"supertech-valves-black-nitride-ej-wrx-sti","title":"Supertech Black Nitride Valves for EJ WRX\/STi","description":"Supertech black nitride exhaust and intake valves for EJ20\/EJ25 Subaru WRX and STi. These valves are available in various sizes to match your head diameter. Sold as a set of 8 or individually as needed. Please do all your research and consult your engine builder if necessary! Black nitride valves are made from one piece forged stainless steel then go through a special hardening process to lessen the friction between the valve and guide. \u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: #ff2a00;\"\u003eVehicle Fitment:\u003c\/span\u003e\u003cbr\u003e 2002-2014 Subaru WRX\u003cbr\u003e 2004-2021 Subaru STi\u003cbr\u003e\u003cbr\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"0\" border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eFitment:\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSize:\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eIncludes:\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003ePart Numbers:\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eExhaust\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eStandard 32.00mm\u003cbr\u003e • Stem Diameter 5.96mm\u003cbr\u003e • Length 104.7mm (std)\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e8 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSEVN-1010-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSEVN-1010-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eExhaust\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+1mm Oversize 33.00mm\u003cbr\u003e • Stem Diameter 5.96mm\u003cbr\u003e • Length 104.20mm (-0.5)\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e8 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSEVN-1014\/2-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSEVN-1014\/2-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eIntake\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eStandard 36.00mm\u003cbr\u003e • Stem Diameter 5.96mm\u003cbr\u003e • Length 104.35mm (std)\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e8 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1010-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1010-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eIntake\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+.5mm Oversize 36.50mm\u003cbr\u003e • Stem Diameter 5.96mm\u003cbr\u003e • Length 104.35mm (std)\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e8 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1012-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1012-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eIntake\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+1mm Oversize 37.00mm\u003cbr\u003e • Stem Diameter 5.96mm\u003cbr\u003e • Length 104.35mm (std)\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e8 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1014-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1014-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003eIntake\u003c\/td\u003e\n\u003ctd rowspan=\"2\" style=\"color: #ffffff;\"\u003e+1mm Oversize 37.00mm\u003cbr\u003e • Stem Diameter 5.96mm\u003cbr\u003e • Length: 103.85mm (short)\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e8 Valves\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1014-2-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"2d2d2d\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e1 Valve\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003eSIVN-1014-2-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr bgcolor=\"404040\"\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e\u003cspan style=\"color: #b3b3b3;\"\u003eExhaust\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e\u003cspan style=\"color: #b3b3b3;\"\u003e+0.5mm Oversize 32.50mm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e\u003cspan style=\"color: #b3b3b3;\"\u003e*Discontinued*\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color: #ffffff;\"\u003e\u003cspan style=\"color: #b3b3b3;\"\u003eSEVN-1012\/2\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\nThe \"Black Nitride\" is a hardening treatment that is applied to the whole valve whereas the chrome coating is only applied to the stem. The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer. Microhardness is 800HV minimum.\u003cbr\u003e\u003cbr\u003eThe Black Nitride surface finish is smoother than with chromed stems, having less friction between stem and guide. The higher the engine speed the bigger the power loss due to internal engine friction! The Black Nitride reduces this power loss due to less valve-guide friction.\u003cbr\u003eImages are for reference.\u003cbr\u003e\u003cbr\u003e \u003cspan style=\"color: #ff2a00;\"\u003eNote:\u003c\/span\u003e\u003cbr\u003eSome Supertech parts have varying part numbers with slashes, dashes, spaces or quantities.\u003cbr\u003e\u003ca href=\"https:\/\/stmtuned.com\/collections\/supertech-products\" style=\"color: #afafaf;\"\u003e\u003cbr\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: .8em;\"\u003e See more Supertech Parts\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/a\u003e","brand":"Supertech","offers":[{"title":"Exhaust 32.00mm (Set of 8) (SEVN-1010-8)","offer_id":50562342682966,"sku":"SUP-SEVN-1010-8","price":185.6,"currency_code":"EUR","in_stock":true},{"title":"Exhaust 32.00mm (1 Single) (SEVN-1010-1)","offer_id":50562342715734,"sku":"SUP-SEVN-1010-1","price":27.23,"currency_code":"EUR","in_stock":true},{"title":"Exhaust 33.00mm (Set of 8) (SEVN-1014\/2-8)","offer_id":50562342748502,"sku":"SUP-SEVN-1014\/2-8","price":185.6,"currency_code":"EUR","in_stock":true},{"title":"Exhaust 33.00mm (1 Single) (SEVN-1014\/2-1)","offer_id":50562342781270,"sku":"SUP-SEVN-1014\/2-1","price":27.23,"currency_code":"EUR","in_stock":true},{"title":"Intake 36.00mm (Set of 8) (SIVN-1010-8)","offer_id":50562342814038,"sku":"SUP-SIVN-1010-8","price":211.4,"currency_code":"EUR","in_stock":true},{"title":"Intake 36.00mm (1 Single) (SIVN-1010-1)","offer_id":50562342846806,"sku":"SUP-SIVN-1010-1","price":27.23,"currency_code":"EUR","in_stock":true},{"title":"Intake 36.50mm (Set of 8) (SIVN-1012-8)","offer_id":50562342879574,"sku":"SUP-SIVN-1012-8","price":185.6,"currency_code":"EUR","in_stock":true},{"title":"Intake 36.50mm (1 Single) (SIVN-1012-1)","offer_id":50562342912342,"sku":"SUP-SIVN-1012-1","price":27.23,"currency_code":"EUR","in_stock":true},{"title":"Intake 37.00mm (Set of 8) (SIVN-1014-8)","offer_id":50562342945110,"sku":"SUP-SIVN-1014-8","price":185.6,"currency_code":"EUR","in_stock":true},{"title":"Intake 37.00mm (1 Single) (SIVN-1014-1)","offer_id":50562342977878,"sku":"SUP-SIVN-1014-1","price":29.21,"currency_code":"EUR","in_stock":true},{"title":"Intake 37.00mm Short (Set of 8) (SIVN-1014-2-8)","offer_id":50562343010646,"sku":"SUP-SIVN-1014-2-8","price":185.6,"currency_code":"EUR","in_stock":true},{"title":"Intake 37.00mm Short (1 Single) (SIVN-1014-2-1)","offer_id":50562343043414,"sku":"SUP-SIVN-1014-2-1","price":27.23,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/9531\/8102\/files\/supertech-valves-black-nitride-ej-wrx-sti-set-of-8.jpg?v=1749201382","url":"https:\/\/www.speed-addicts.com\/en\/products\/supertech-valves-black-nitride-ej-wrx-sti","provider":"Speed Addicts","version":"1.0","type":"link"}