Manley 612000CB-1 Platinum Dish Piston for Subaru EJ257 99.5mm STD Bore

Vehicle Fitment

• 2004-2021 Subaru WRX STI (EJ257 2.5L turbocharged flat-4)
• 2006-2014 Subaru WRX (EJ257 2.5L turbocharged flat-4)

Features

• Platinum Series forged piston engineered for performance and durability
• Made from high-strength 2618 aluminum alloy for excellent fatigue resistance
• 99.50 mm Grade B bore size for STD Subaru EJ257 applications
• Dish piston design with -22 cc volume to support tuned compression ratios
• Offset wrist pin design helps reduce noise and improve start-up characteristics
• Moly-coated skirts for reduced friction and wear
• Includes premium chrome moly wrist pin and round wire locks
• Comes with premium steel top ring set for improved sealing and reduced blow-by

Specifications

• Part Number: Manley 612000CB-1
• Bore Size: 99.50 mm (Grade B) - STD
• Rod Length Compatibility: 5.137"
• Stroke: 79 mm (2.5L EJ257)
• Compression Distance: 1.209"
• Dome/Dish Volume: -22 cc (Dish type)
• Compression Ratio: ~8.5:1 in EJ257 configuration
• Piston Weight: ~395 g
• Piston Ring Set: Included (e.g., 46995DT-1)
• Wrist Pin: Chrome moly included

Included Components

• 1x Platinum Series forged piston (single)
• 1x Premium steel top ring set
• 1x Chrome moly wrist pin
• 1x Set of round wire locks

Product Description

The Manley 612000CB-1 Platinum Dish Piston is a high-performance forged piston designed for Subaru WRX and WRX STI EJ257 engines. Machined from premium 2618 aluminum alloy, these pistons offer strength and fatigue resistance essential for boosted and high-RPM applications. The dish-style crown with -22 cc volume helps tailor the compression ratio for performance builds, while moly-coated skirts and an offset wrist pin design help reduce friction and noise during operation.

Each single piston includes a premium steel top ring set, chrome moly wrist pin, and round wire locks, providing a complete piece for engine assembly. Designed to match the 99.50 mm Grade B bore size of Subaru EJ257 engines found in 2004-2021 WRX STI and 2006-2014 WRX models, this piston is suitable for performance rebuilds or turbocharged engine upgrades. Note that these pistons are sold individually - order the correct grade (A or B) based on your block bore readings.