JE Pistons SUB WRXHD/STI EJ257 Block w/ EJ20 Head 99.5mm Bore Standard Size KIT Set of 4 Pistons

Sport Compact, Import and European forged pistons from JE Pistons are the result of over 75 years of industry leading experience extended to our range of premium forged pistons for Subaru STI EJ257 Engines. JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From drift track to drag strip, JE Pistons’ performance is proven in victory lane time and time again. Equipped with the following custom level features

Additional Information

JE, Subaru, EJ Series, 3.918 in. Bore, 9.50:1, Inverted Dome/Dish, 4 Cyl. Piston Kit

Part Type

Engine Piston Kit

• Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
• Designed specifically for Subaru STI EJ257 Engines. To provide optimized performance durability
• Forged in the USA using 2618 aluminum, yielding tensile strength and minimal thermal expansion
• Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
• Made 100% in the USA
• Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
• Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pin
• Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise

Note for Pistons, Rings, Rotors, Rods and engine internals

Unless otherwise specified, some brands supply brake rotors, pistons, strut mounts, rods and rings separately. In some cases, titles may indicate plural, or 'set' - eg the term “ring set” often refers to the rings for a single piston only. If you’re unsure about what’s included with this product, please contact our team for clarification.

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Reference Information