{"product_id":"wiseco-subaru-ej257-wrx-sti-4v-dish-19cc-99-75-piston-shelf-stock-kit-1","title":"Wiseco K598M9975AP Forged 99.75 mm Dish Pistons for Subaru EJ255 \/ EJ257","description":"\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eSubaru Impreza WRX \/ STI (EJ257, 2.5 L 16V)\u003c\/li\u003e \u003cli\u003eSubaru Forester, Legacy, Outback with 2.5L DOHC Turbo (EJ255 \/ EJ257)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eForged from 2618 aluminum for high strength and durability\u003c\/li\u003e \u003cli\u003eArmorGlide® skirt coating to reduce friction and increase longevity\u003c\/li\u003e \u003cli\u003eDish-style crown with -19 cc volume for lower static compression\u003c\/li\u003e \u003cli\u003eStrutted forging for enhanced rigidity under load\u003c\/li\u003e \u003cli\u003eAnti-detonation groove to resist knock\u003c\/li\u003e \u003cli\u003eForced-pin oiling to ensure reliable wrist-pin lubrication\u003c\/li\u003e \u003cli\u003eIncludes pre-gapped ring set (9975VF) for easy installation\u003c\/li\u003e \u003cli\u003eOptimized for high-performance or turbocharged builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eBore Diameter: 99.75 mm\u003c\/li\u003e \u003cli\u003eCompression Height: 30.70 mm\u003c\/li\u003e \u003cli\u003ePiston Dish Volume: -19.00 cc\u003c\/li\u003e \u003cli\u003eStatic Compression Ratio: ~9.0:1\u003c\/li\u003e \u003cli\u003eWrist Pin Diameter: 23.00 mm\u003c\/li\u003e \u003cli\u003ePiston Material: Forged 2618 Aluminum\u003c\/li\u003e \u003cli\u003eApproximate Piston Weight: ~382 g\u003c\/li\u003e \u003cli\u003eRing Set: 9975VF (included)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e4x Forged Pistons\u003c\/li\u003e \u003cli\u003e4x 23 mm Wrist Pins\u003c\/li\u003e \u003cli\u003e1x Pre-gapped Ring Set (9975VF)\u003c\/li\u003e \u003cli\u003e4x Circlips \/ Locks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003eThe Wiseco K598M9975AP is a high-performance forged piston kit crafted for Subaru's 2.5 L DOHC turbo engines, specifically for EJ255 and EJ257 applications. The 99.75 mm bore and -19 cc dish design provide a lower static compression ratio (~9.0:1), making this kit ideal for boosted or high-boost turbo builds.\u003c\/p\u003e\u003cp\u003eConstructed from 2618 aluminum, these pistons are lightweight yet exceptionally durable. Their strutted forging structure gives added strength, while the ArmorGlide® coating helps minimize friction and wear. The built-in anti-detonation groove helps to improve combustion stability under demanding conditions.\u003c\/p\u003e\u003cp\u003eThis kit includes 23 mm floating wrist pins with forced-pin oiling for reliable lubrication, and the 9975VF ring set comes pre-gapped, making installation simpler. These pistons offer a dependable and race-ready foundation for high-power Subaru turbo setups.\u003c\/p\u003e","brand":"Wiseco","offers":[{"title":"Default Title","offer_id":53325024330047,"sku":"WISK598M9975AP","price":752.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/b640dfdcf1687cae875855b8389e76c4L_77fe4078-3c72-43de-b281-ee4922aa72aa.jpg?v=1780025346","url":"https:\/\/wcaperformance.com\/products\/wiseco-subaru-ej257-wrx-sti-4v-dish-19cc-99-75-piston-shelf-stock-kit-1","provider":"WCA Performance","version":"1.0","type":"link"}