{"product_id":"cp-piston-ring-set-for-subaru-ej257-wrx-sti-bore-100-5mm-size-1-0mm-cr-8-2-set-of-4","title":"CP Piston \u0026 Ring Set for Subaru EJ257 WRX STi - Bore (100.5mm) - Size (+1.0mm)  - CR (8.2)  Set of 4","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003eSC7423-4\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eCP Piston \u0026amp;amp. Ring Set for 2004-2012 Subaru Impreza WRX STI EJ257 - Bore 100.5mm - Size +1.0mm - CR 8.2 Set of 4\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eEquip your 2004-2012 Subaru Impreza WRX STI EJ257 engine with this CP forged piston and ring set machined to 100.5mm bore and +1.0mm oversize for rebuilt cylinders. The 8.2:1 compression ratio supports high boost turbo configurations delivering reliable power in demanding track or street applications. This complete set of 4 pistons and rings ensures balanced performance and durability under extreme conditions.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eForged 2618-T61 Alloy:\u003c\/strong\u003e Delivers high strength to handle 50+ psi boost levels and resist detonation in turbocharged EJ257 engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8.2:1 Compression Ratio:\u003c\/strong\u003e Enables safe operation with large turbos and E85 fuel for substantial horsepower gains beyond 600whp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100.5mm Bore +1.0mm Oversize:\u003c\/strong\u003e Precision fit after standard cylinder boring restores compression and allows thicker head gasket for boost\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArmor Glazed Skirts:\u003c\/strong\u003e Reduces friction by 40% for quieter operation smoother revs and extended cylinder life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccumulator Groove \u0026amp;amp. Ring Pack:\u003c\/strong\u003e Includes 1.2mm\/1.5mm\/2.8mm rings with groove design to eliminate ring flutter at 9000+ RPM\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder boring and honing to 100.5mm required prior to installation\u003c\/li\u003e\n\u003cli\u003ePair with CP-Carrillo rods for complete rotating assembly balance\u003c\/li\u003e\n\u003cli\u003eBox dimensions 14in x 10in x 8in for secure transit\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\u003eVerify 130.5mm connecting rod length and 79mm stroke compatibility\u003c\/li\u003e\n\u003cli\u003eIncludes 927 chromoly wrist pins with circlips OEM hardware compatible\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\u003e2004-2012\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\u003e2011-2012\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 CP Pistons?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProven in NHRA Pro Stock and Formula Drift championship engines\u003c\/li\u003e\n\u003cli\u003eCNC machined in USA with tolerances under 0.0002 inches\u003c\/li\u003e\n\u003cli\u003eBacked by limited lifetime warranty against manufacturing defects\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 set fit 2013+ Subaru STI models?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Confirmed fit for 2004-2012 EJ257 Impreza WRX STI verify block casting EJ257 turbo\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What piston weight and compression height?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Each piston 372g net weight 30mm compression height matched to EJ257 79mm stroke 130.5mm rods\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What rings are included and warranty details?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e CP premium ring set 1.2\/1.5\/2.8mm sizes limited lifetime warranty on defects when installed properly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eShipping \u0026amp;amp. Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground or FedEx\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-lined custom box 14 x 10 x 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.8 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CP Pistons","offers":[{"title":"Default Title","offer_id":43720402894927,"sku":"CPPSC7423-4","price":885.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/cp-piston-ring-set-for-subaru-ej257-wrx-sti-bore-100_5mm-size-1_0mm-cr-8_2-set-of-4-cp-pistons.jpg?v=1769636140","url":"https:\/\/www.blackopsautoworks.com\/products\/cp-piston-ring-set-for-subaru-ej257-wrx-sti-bore-100-5mm-size-1-0mm-cr-8-2-set-of-4","provider":"Black Ops Auto Works","version":"1.0","type":"link"}