Manley Performance Pistons

Fits 2004+ Subaru WRX STi with EJ257 Engine

Part #: 612005C-4

Overview

The Manley Platinum Series piston set is designed for high-performance Subaru WRX STi enthusiasts and professional engine builders seeking durability and reliability under demanding conditions. Crafted from premium 2618 alloy forgings, these pistons deliver exceptional strength and thermal stability, making them ideal for tuning applications and high-horsepower builds. The set includes pistons with a 100mm stroke and a +0.5mm bore, optimized for the EJ257 engine, providing a reliable foundation for increased power and performance. Whether you're restoring a stock engine or building a custom turbocharged setup, these pistons help support your goals with proven design and materials. Primary benefits include enhanced durability, improved heat resistance, and consistent performance during aggressive driving or tuning. The moly skirt coatings reduce friction and wear, extending the lifespan of your engine components. The tool steel wrist pins ensure secure attachment and longevity, making these pistons suitable for both daily driving and competitive applications.

Key Features

Designed with high-quality materials and precision engineering, the Manley Platinum Series pistons feature:

• 2618 aluminum alloy forgings for superior strength and thermal expansion control
• Proven cam and barrel skirt profiles for optimal fit and performance
• Tool steel wrist pins for durability and secure fit
• Moly skirt coatings to reduce friction and wear
• Standard stroke of 100mm with +0.5mm bore for precise fitment
• Optimized dish design for efficient combustion and compression
• Engineered for high-performance turbocharged Subaru EJ257 engines

Construction & Design

These pistons are meticulously crafted from high-grade 2618 alloy forgings, known for their excellent strength-to-weight ratio and thermal properties. The moly skirt coatings provide a low-friction surface, enhancing durability and reducing engine wear. The design incorporates proven profiles that support high-performance tuning, ensuring reliable operation under increased boost and power levels.

Driving Feel & Feedback

While primarily a performance upgrade, these pistons contribute to smoother engine response and consistent power delivery. They support your engine's ability to handle higher compression ratios and boost pressures, resulting in improved throttle response and overall driving engagement.

Installation & Fitment

Designed specifically for the 2004 and newer Subaru WRX STi models equipped with the EJ257 engine, these pistons are intended for professional installation or experienced enthusiasts familiar with engine rebuilds. Proper machining and assembly are recommended to ensure optimal performance and longevity.

What’s Included

This set includes all four pistons, complete with moly skirt coatings and tool steel wrist pins, ready for installation in your EJ257 engine. Additional hardware or components are not included and may be required for full engine assembly.