Manley Performance

Fits 2004+ Subaru WRX STi with EJ257 Engine

Part #: 622000C-4

Overview

The Manley Platinum Series piston set is a high-performance upgrade designed specifically for Subaru WRX STi models equipped with the EJ257 engine. Crafted from premium 2618 alloy forgings, these pistons are engineered to withstand the rigors of high-revving, turbocharged applications. Ideal for professional engine builders, tuners, and enthusiasts seeking to enhance engine durability and performance, this piston set offers a reliable foundation for custom builds and performance upgrades. The combination of advanced materials and proven design profiles ensures optimal response, heat management, and longevity under demanding conditions. Whether you're building a high-horsepower street car or a track-ready machine, these pistons provide the strength and precision needed for consistent performance. The inclusion of tool steel wrist pins and moly skirt coatings on select part numbers further enhances durability, reducing wear and maintaining tight clearances over time. This set is an excellent choice for those looking to improve engine efficiency, responsiveness, and overall power output.

Key Features

Designed with performance and durability in mind, the Manley Platinum Series pistons feature:

• 2618 alloy forgings for superior strength and thermal stability
• Optimized cam and barrel skirt profiles for reduced friction and enhanced response
• Tool steel wrist pins for increased durability and reliability
• Moly skirt coatings on select models to reduce wear and improve lubrication
• 83mm stroke and 99.5mm bore for a stroker configuration that boosts displacement
• Designed to support high-performance turbocharged builds
• Precision-machined for exact fitment and consistent performance

Construction & Design

The pistons are crafted from high-quality 2618 aluminum alloy, known for its excellent strength-to-weight ratio and thermal properties. The forged construction ensures durability under high-pressure conditions, while the moly skirt coatings provide reduced friction and wear. The design incorporates proven profiles that optimize piston stability and response during high RPM operation, making them suitable for demanding performance applications.

Performance & Response

These pistons are engineered to support increased power output and engine responsiveness. Their robust construction helps maintain precise combustion chamber geometry, contributing to improved throttle response and overall engine efficiency. Ideal for turbocharged setups, they help manage heat and pressure effectively, supporting reliable performance during spirited driving or racing conditions.

Installation & Fitment

Designed for direct replacement in 2004 and newer Subaru WRX STi models with the EJ257 engine, these pistons require professional installation and proper engine assembly techniques to ensure optimal performance and longevity.

What’s Included

This set includes four forged pistons with rings and wrist pins, ready for installation in your high-performance engine build.

Ideal For

Perfect for engine builders, tuners, and enthusiasts aiming to increase displacement and power in their Subaru WRX STi, whether for street, track, or competition use.