{"product_id":"manley-04-wrx-sti-ej257-size-std-stroke-79mm-bore-99-50mm-grade-a-single-piston-w-rings","title":"Manley 04+ WRX STi (EJ257) Size (STD)  Stroke (79mm) Bore (99.50mm Grade A) SINGLE Piston w\/ Rings","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003e612000CA-1\u003c\/span\u003e | \u003cstrong\u003eUPC:\u003c\/strong\u003e 807298084398\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eManley 04+ WRX STi (EJ257) Size (STD) Stroke (79mm) Bore (99.50mm Grade A) SINGLE Piston w\/ Rings\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eManley Platinum Series piston delivers forged strength for 2004-2021 Subaru Impreza WRX STI models with EJ257 2.5L turbo engines. This single STD size piston matches stock stroke of 79mm and bore of 99.50mm for direct replacement in high-boost builds. Engine builders choose it for handling increased power while maintaining ring seal and heat resistance.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2618-T61 Alloy Forging:\u003c\/strong\u003e High-silicon aluminum construction resists detonation and supports 1000+ HP builds with tight tolerances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Skirt Profiles:\u003c\/strong\u003e Cam and barrel shapes reduce friction and noise for smoother operation across RPM ranges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Steel Wrist Pins:\u003c\/strong\u003e Hardened H13 pins with wire locks ensure secure connection under extreme loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoly Skirt Coating:\u003c\/strong\u003e Reduces wear on cylinder walls and improves break-in on select applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Rings and Grade A Specs:\u003c\/strong\u003e Premium ring pack and weight-matched Grade A piston at 435 grams for balanced sets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSold as single piston order four for complete engine set and match grades for balance.\u003c\/li\u003e\n\u003cli\u003eCompression height 30.13mm suits stock rods and stroker cranks.\u003c\/li\u003e\n\u003cli\u003eRequires ring filing for optimal end gap in performance setups.\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 bore size and hone cylinders to 99.51-99.53mm for proper clearance.\u003c\/li\u003e\n\u003cli\u003eCompatible with stock or aftermarket rods pins pre-installed.\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\u003e2004-2007\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza WRX STI\u003c\/td\u003e\n\u003ctd\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008-2014\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza WRX STI\u003c\/td\u003e\n\u003ctd\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2021\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eWRX STI\u003c\/td\u003e\n\u003ctd\u003eAll\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\u003eProven in racing and street builds by tuners worldwide.\u003c\/li\u003e\n\u003cli\u003eDurable design withstands high boost and nitrous applications.\u003c\/li\u003e\n\u003cli\u003ePrecision CNC machining 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 piston fit my 2017 WRX STI EJ257?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Yes fits all 2004-2021 EJ257 engines including USDM JDM and hatchback sedan variants with 99.50mm STD bore.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What material is used and any special coatings?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Forged from 2618-T61 aluminum alloy with moly skirt coating for reduced friction and tool steel pin.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What warranty applies and installation tips?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Manley offers defect warranty contact for details. Gap rings to 0.004-0.005 inch on top ring and use assembly lube.\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 USPS Priority\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 box 6 x 6 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 lb\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":41147020804175,"sku":"MAN612000CA-1","price":199.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/products\/manley-04-wrx-sti-ej257-size-std-stroke-79mm-bore-99_50mm-grade-a-single-piston-w-rings-manley-performance.jpg?v=1772547898","url":"https:\/\/www.blackopsautoworks.com\/products\/manley-04-wrx-sti-ej257-size-std-stroke-79mm-bore-99-50mm-grade-a-single-piston-w-rings","provider":"Black Ops Auto Works","version":"1.0","type":"link"}