Manley Performance Pistons

Fits Subaru WRX STi 2004+ with EJ257 Engine

Part #: 612002C-4

Overview

The Manley Platinum Series piston set is designed for high-performance Subaru WRX STi enthusiasts and professional engine builders seeking durability and reliable power support. Crafted from premium 2618 alloy forgings, these pistons deliver exceptional strength and thermal stability, making them ideal for turbocharged applications and aggressive tuning. The set features a 99.75mm stroke with a +0.25mm bore, optimized for performance upgrades and engine rebuilds. Whether you're enhancing your vehicle’s response or ensuring long-term reliability, these pistons provide a solid foundation for your build. Constructed with proven cam and barrel skirt profiles, the pistons promote efficient combustion and reduced friction. Tool steel wrist pins and moly skirt coatings on select models further enhance durability and wear resistance, supporting sustained high-performance operation. Designed to meet the demands of high-horsepower applications, these pistons help maintain engine integrity under stress while contributing to improved power delivery and efficiency.

Key Features

Manley's Platinum Series pistons are engineered with precision and quality materials to support your performance goals. Key features include:

• Made from high-strength 2618 alloy forgings for durability and thermal stability
• Designed with proven cam and barrel skirt profiles for optimal combustion and reduced friction
• Includes moly skirt coatings on select models for enhanced wear resistance
• Tool steel wrist pins for added strength and longevity
• Specifically engineered for turbocharged Subaru EJ257 engines
• Optimized for high-performance rebuilds and tuning projects

Construction & Design

The pistons feature a robust forging process using 2618 alloy, known for its excellent strength-to-weight ratio and heat resistance. The precise machining and coating applications ensure consistent quality and performance. The design incorporates a dish shape with an 8.5:1 compression ratio, suitable for turbocharged setups, providing a balance of power and reliability.

Driving Feel & Feedback

These pistons are intended to support a responsive and reliable engine feel, especially under high-stress conditions typical of tuned or modified vehicles. They help maintain smooth operation and consistent power delivery, contributing to a confident driving experience.

Installation & Fitment

Designed as a direct replacement for Subaru WRX STi models with EJ257 engines, these pistons are compatible with standard bore sizes and require professional installation for optimal results.

What’s Included

The package includes a complete set of pistons with rings, designed to match the specifications of your engine rebuild or upgrade.