Manley 632700CB-1 Forged Turbo Piston for Subaru EJ257 100.00mm +.50

Vehicle Fitment

• 2004-2021 Subaru WRX STI (EJ257 2.5L turbo Boxer engine)
• 2006-2014 Subaru WRX (EJ255/EJ257 turbo Boxer engines)
• Other EJ25 platforms bored to 100.00 mm +.50 oversize

Features

• Platinum Series forged turbo piston engineered for high-performance use
• Premium 2618 aluminum alloy forging for strength and durability
• 100.00 mm +.50 bore size - Grade C fitment for EJ25 blocks
• Turbo-optimized piston profile supports forced induction applications
• Moly-coated skirts for reduced friction and improved wear resistance
• Offset wrist pin design improves start-up behavior and reduces noise
• Chromium moly wrist pin and round wire locks included
• Precision machining for superior ring seal and combustion control

Specifications

• Part Number: Manley 632700CB-1
• Bore Size: 100.00 mm +.50 mm oversize
• Piston Type: Turbo-optimized forged piston
• Compression Height: ~1.209" (EJ platform-specific)
• Piston Weight: ~410 g each
• Rod Length Compatibility: 5.137"
• Stroke Compatibility: 79 mm (EJ25 series)
• Wrist Pin: .9055" (23 mm) chrome moly steel

Included Components

• 1x Platinum Series forged turbo piston
• 1x Premium piston ring set
• 1x Chrome moly wrist pin
• 1x Set of round wire locks

Product Description

The Manley 632700CB-1 Platinum Series Turbo Piston is a forged high-performance piston designed for Subaru EJ25 engines bored to 100.00 mm +.50 oversize, including WRX STI and WRX applications. Crafted from premium 2618 aluminum alloy and precision machined, this piston features a turbo-optimized profile and moly-coated skirt to reduce friction and wear in boosted environments. The offset wrist pin design improves start-up smoothness and reduces noise, making it well-suited for performance and competition engines.

Each single piston includes a premium piston ring set, chrome moly wrist pin, and round wire locks for secure assembly. Built for strength and durability under high cylinder pressures, this forged piston is ideal for turbocharged WRX and WRX STI engine builds that require oversize components due to bore wear or performance re-bore. Sold individually by bore size grade - always confirm block measurements before ordering.