Manley 612002C-4 Platinum Dish Pistons for Subaru EJ257 99.75mm +.25

Vehicle Fitment

• 2004-2021 Subaru WRX STI (EJ257 2.5L turbo Boxer engine)
• 2006-2014 Subaru WRX (EJ255/EJ257 2.5L turbo Boxer engines)
• Other Subaru EJ25 platforms with 99.75 mm +.25 bore (EJ255/EJ257)

Features

• Platinum Series forged pistons for high-performance engines
• High-strength 2618 aluminum alloy forgings for durability and fatigue resistance
• Dish piston design with -22 cc volume for a tuned ~8.5:1 compression ratio
• Moly-coated skirts to reduce friction and wear
• Offset wrist pin for smoother cold start and reduced noise
• Pressure balance groove for enhanced lubrication performance
• Premium steel top rings and round wire locks included
• Designed for boosted applications and high-RPM builds

Specifications

• Part Number: Manley 612002C-4
• Bore Size: 99.75 mm + .25 mm oversize
• Compression Height: 1.209" (30.71 mm)
• Piston Type: Dish (-22 cc)
• Piston Weight: ~398 g each
• Rod Length Compatibility: 5.137" (130.5 mm)
• Stroke: 79 mm
• Compression Ratio: ~8.5:1 typical in EJ257 configuration
• Wrist Pin Size: .9055" (23 mm) with .180" wall

Included Components

• 4x Platinum Series forged pistons
• 4x Premium steel top ring sets
• 4x Chrome moly wrist pins
• 4x Round wire locks

Product Description

The Manley 612002C-4 Platinum Series Dish Piston Set is engineered for high-performance Subaru EJ25 engines, including WRX STI and WRX models with a 99.75 mm +.25 bore. These forged 2618 aluminum pistons are built for reliability and strength in boosted and high-RPM applications, featuring a dish-style crown with -22 cc volume that yields a tuned ~8.5:1 compression ratio suitable for performance builds. The moly-coated skirts and offset wrist pin help reduce friction and noise, while the pressure balance groove enhances lubrication at speed.

Each set includes premium steel top rings, chrome moly wrist pins, and round wire locks, making it a complete internals upgrade for EJ257 engines found in Subaru WRX STI and WRX applications. Designed with precision machining and quality materials, this piston set is ideal for enthusiasts building high-output or race-oriented Subaru engines that require robust forged components.