{"product_id":"manley-04-07-wrx-sti-ej257-platinum-series-8-5-1-dish-pistons-with-rings-99-75mm-25mm-bore","title":"Manley 04-07 WRX STI EJ257 Platinum Series 8.5:1 Dish Pistons with Rings - 99.75mm +.25mm Bore","description":"Our signature \"Platinum Series\" pistons feature 2618 alloy forgings, proven cam and barrel skirt profiles, tool steel wrist pins, and moly skirt coatings on select part numbers. Join the ranks of professional engine builders and tuners who rely on Manley pistons for superior performance and durability.\n\u003cul\u003e\n  \u003cli\u003eChrome Moly Wrist Pins: Premium Chrome Moly wrist pins come standard with our Standard Series Pistons. For select SKUs, we offer wrist pin upgrades to 9310 and Turbo Tuff\/DLC alloys, providing additional durability.\u003c\/li\u003e\n  \u003cli\u003eUnique Fixturing: Manley's unique fixturing allows for skirt turning and ring groove machining in a single operation, ensuring ultimate ring groove to skirt squareness.\u003c\/li\u003e\n  \u003cli\u003eExacting Ring Lands and Grooves: We adhere to strict standards for piston ring lands and grooves, resulting in enhanced ring seal and more power.\u003c\/li\u003e\n  \u003cli\u003eCam and Barrel Profiles: Our pistons boast cam and barrel (skirt) profiles that generate substantial power while being gentle on cylinder walls.\u003c\/li\u003e\n  \u003cli\u003e2618 Alloy Forgings: We use domestic 2618 alloy forgings, ensuring superior strength and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eManley Performance Platinum Series pistons are designed for 04-07 WRX STI models equipped with the Subaru EJ257 engine. This piston set features a de-stroked 75mm configuration, 99.75mm bore size, 8.5:1 compression ratio, and includes piston rings for a complete installation solution. Part number MAN621002C-4 is intended for performance engine builds where strength, accurate ring sealing, and durable operation are important.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeature:\u003c\/strong\u003e Forged from domestic 2618 aluminum alloy for high strength and performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeature:\u003c\/strong\u003e Includes chrome moly wrist pins and piston rings for the specified application.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeature:\u003c\/strong\u003e Designed with cam and barrel skirt profiles that support power production while helping reduce cylinder-wall wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eManley Performance uses specialized fixturing to machine the skirt and ring grooves in a single operation. This manufacturing process helps maintain precise ring-groove-to-skirt squareness, supporting consistent piston movement and ring performance. Exacting control of the ring lands and grooves promotes improved ring seal, which can contribute to more efficient combustion and dependable performance in demanding Subaru EJ257 applications.\u003c\/p\u003e\n\u003cp\u003eThe Platinum Series design also incorporates proven skirt profiles and durable tool steel wrist pin construction. These pistons are suited to professional engine builders, tuners, and enthusiasts developing a performance-oriented EJ257 engine. Verify compression ratio, bore size, stroke, piston-to-wall clearance, ring end gap, and all other assembly specifications with your engine builder before installation. This product is not CARB approved and may require acknowledgment of applicable emissions restrictions. Part number MAN621002C-4 identifies this Manley Performance piston set.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eForged from domestic 2618 aluminum alloy for high strength and performance\u003c\/li\u003e\n\u003cli\u003eIncludes chrome moly wrist pins and piston rings\u003c\/li\u003e\n\u003cli\u003e75mm de-stroked configuration for Subaru EJ257 engine builds\u003c\/li\u003e\n\u003cli\u003e99.75mm +.25mm bore specification with an 8.5:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eCam and barrel skirt profiles designed for power and reduced cylinder-wall wear\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring lands and grooves support consistent ring sealing\u003c\/li\u003e\n\u003cli\u003eCompatible with 04-07 Subaru WRX STI EJ257 applications\u003c\/li\u003e\n\u003cli\u003eManley Performance part number MAN621002C-4\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cbr\u003e\n\u003cbr\u003e\nAir Freight Prohibited: false\u003cbr\u003e\nNot Carb Approved: true\u003cbr\u003e\nCarb Acknowledgement Required: true\u003cbr\u003e\nLtl Freight Required: false\u003cbr\u003e\nProp 65: Y\u003cbr\u003e\nPart Type: automotive\u003cbr\u003e\nEpa: N\/A\u003cbr\u003e\nRegular Stock: false\u003cbr\u003e\nUnits Per Sku: 1\u003cbr\u003e\nFitment:\u003cbr\u003e\nSubaru Impreza WRX 2006\u003cbr\u003e\nSubaru Impreza WRX 2007\u003cbr\u003e\nSubaru Impreza WRX 2008\u003cbr\u003e\nSubaru Impreza WRX 2009\u003cbr\u003e\nSubaru Impreza WRX 2010\u003cbr\u003e\nSubaru Impreza WRX 2011\u003cbr\u003e\nSubaru Impreza WRX 2012\u003cbr\u003e\nSubaru Impreza WRX Limited 2006\u003cbr\u003e\nSubaru Impreza WRX Limited 2007\u003cbr\u003e\nSubaru Impreza WRX Limited 2010\u003cbr\u003e\nSubaru Impreza WRX Limited 2011\u003cbr\u003e\nSubaru Impreza WRX Limited 2012\u003cbr\u003e\nSubaru Impreza WRX Premium 2009\u003cbr\u003e\nSubaru Impreza WRX Premium 2010\u003cbr\u003e\nSubaru Impreza WRX Premium 2011\u003cbr\u003e\nSubaru Impreza WRX Premium 2012\u003cbr\u003e\nSubaru Impreza WRX STI 2004\u003cbr\u003e\nSubaru Impreza WRX STI 2005\u003cbr\u003e\nSubaru Impreza WRX STI 2006\u003cbr\u003e\nSubaru Impreza WRX STI 2007\u003cbr\u003e\nSubaru Impreza WRX STI 2008\u003cbr\u003e\nSubaru Impreza WRX STI 2009\u003cbr\u003e\nSubaru Impreza WRX STI 2010\u003cbr\u003e\nSubaru Impreza WRX STI 2011\u003cbr\u003e\nSubaru Impreza WRX STI 2012\u003cbr\u003e\nSubaru Impreza WRX STI Limited 2007\u003cbr\u003e\nSubaru Impreza WRX STI Limited 2011\u003cbr\u003e\nSubaru Impreza WRX STI Limited 2012\u003cbr\u003e\nSubaru Impreza WRX STI Special Edition 2010\u003cbr\u003e\nSubaru Impreza WRX TR 2006\u003cbr\u003e\nSubaru Impreza WRX TR 2007","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":47258140967014,"sku":"man621002C-4","price":741.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0075\/8703\/7237\/files\/group-6fb279de-3abc-410e-9607-f540300bf0a1-800_1d095444-13bf-4fef-a86c-106147892f11.jpg?v=1790174982","url":"https:\/\/jdmuscleusa.com\/products\/manley-04-07-wrx-sti-ej257-platinum-series-8-5-1-dish-pistons-with-rings-99-75mm-25mm-bore","provider":"JDMuscle","version":"1.0","type":"link"}