JE Pistons 296348 99.75mm Forged Piston Kit for 2002-2015 Subaru EJ25 (WRX/

Vehicle Fitment

• Subaru 2.5L EJ-series engines (EJ255 / EJ257) - including but not limited to:
• Subaru WRX / WRX STI (various model years 2002-2015)
• Subaru Forester XT
• Subaru Legacy / Outback 2.5T / GT-spec (where EJ25 applies)

Features

• Forged 2618-T6 aluminum pistons - high tensile strength for boosted or high-performance use
• 99.75 mm bore - oversize piston kit designed for EJ25 blocks
• FSR (Forged Side Relief) skirt design - reduces skirt width and friction for improved efficiency and reliability under stress
• Dish-crown piston head with optimized crown geometry for reliable combustion and valve clearance
• Includes wrist pins, locks, and high-quality piston rings - a complete set for full engine rebuild or upgrade
• CNC-machined for precision ring-land, piston geometry and uniform crown thickness - suitable for high-boost, performance, or turbo builds
• Designed for high load, turbocharged, or competition-use conditions - improved durability vs stock pistons
• Made in USA forging and machining standards - ensures consistent quality and reliability

Specifications

• Bore Diameter: 99.75 mm (oversize kit)
• Piston Material: Forged 2618-T6 Aluminum Alloy
• Piston Crown: Dish-type (negative-volume / depressed crown)
• Approx. Compression Ratio (stock stroke/rod/heads): ~8.5 : 1 (as designed) - suited for turbo/boost or high-compression head builds
• Wrist Pin: Straight-wall carbon steel, 0.905 in (23.0 mm) OD, length ~2.25 in
• Piston Weight: ~405-410 g each (set of 4 pistons) - matched set for balance
• Included Components: 4x Pistons, 4x Wrist pins, 8x Pin-lock circlips, Full piston-ring sets (top, second, oil rings)
• Intended Use: Subaru EJ25-series engines (turbo or naturally-aspirated), stock-bore or rebuild applications requiring forged internals

Included Components

• 4x Forged pistons (99.75 mm bore, dish-crown)
• 4x Wrist pins (0.905 in / 23.0 mm OD)
• 8x Pin-lock circlips / retaining clips
• 4x Full piston-ring sets (top, second, oil rings)

Product Description

JE Pistons 296348 is a forged-piston kit engineered for Subaru's 2.5 L EJ-series engines (EJ255 / EJ257), commonly found in WRX, STI, Forester XT, Legacy/Outback 2.5T, and other EJ25-based applications. The 99.75 mm oversize pistons offer increased strength and durability - ideal for turbo, high-boost, or performance-tuned builds that demand more than the stock cast pistons can reliably support. Constructed from 2618-T6 forged aluminum, these pistons handle high thermal and mechanical stress while maintaining precise tolerances, making them suitable for street, track, or competition builds.

Thanks to the FSR skirt design and dish-crown geometry, the pistons reduce reciprocating mass, minimize friction, and ensure safe valve clearance - which helps with throttle response, ring sealing, and engine longevity under high load. The kit comes complete with all necessary components (rings, wrist pins, locks), allowing a full top-end rebuild right out of the box. Whether you're restoring a worn EJ25 engine, upgrading for boost, or building a performance platform - the 296348 kit gives you a strong, reliable foundation.