Manley Performance Pistons

Fitment Summary

Part #: 620005C-1

Overview

The Manley Platinum Series pistons are high-performance engine components designed for Subaru WRX models with the EJ205 engine, specifically for those seeking to enhance their engine's power and durability. Crafted from premium 2618 alloy forgings, these pistons are engineered to withstand the rigors of high-stress tuning environments. Ideal for professional engine builders, tuners, and automotive enthusiasts, they provide a reliable foundation for building a stroker engine with increased displacement and performance potential. The pistons feature a 79mm bore with a +4mm stroke, resulting in a 92.5mm piston diameter and a 8.5:1 compression ratio, making them suitable for custom performance builds that demand strength and consistency. These pistons are designed to support high-performance applications, offering improved response, durability, and efficiency. Whether you're upgrading for increased horsepower or building a reliable daily driver with enhanced power, these pistons help achieve your engine goals with confidence.

Key Features

The Platinum Series pistons incorporate advanced materials and thoughtful design features to optimize engine performance and longevity:

• Forged from 2618 aluminum alloy for superior strength and heat resistance
• Proven cam and barrel skirt profiles for enhanced durability and stability under high loads
• Tool steel wrist pins for increased wear resistance and reliability
• Moly skirt coatings on select part numbers to reduce friction and improve piston longevity
• Designed for increased displacement with a +4mm stroke and 79mm bore
• Optimized for high-performance turbocharged applications
• Precision-machined for a perfect fit and consistent performance

Construction & Design

These pistons feature a robust forging process utilizing 2618 alloy, known for its excellent strength-to-weight ratio and thermal properties. The moly skirt coatings help reduce friction and wear, extending piston life during aggressive driving and tuning. The design includes carefully engineered cam and barrel skirt profiles to ensure optimal piston stability and minimal piston slap, contributing to smoother operation and reduced engine noise.

Performance & Response

Designed to support high-stress engine builds, these pistons help improve throttle response and overall engine responsiveness. Their durable construction ensures consistent performance under increased boost pressures and elevated RPM ranges, making them suitable for serious tuning projects and competitive motorsports.

Installation & Fitment

These pistons are intended for use in Subaru WRX models equipped with the EJ205 engine, specifically for applications requiring a 79mm bore and +4mm stroke. Proper installation requires precise machining and assembly by qualified technicians familiar with high-performance engine builds.

What’s Included

The package includes a set of forged pistons designed for a 98+ Subaru WRX with the specified dimensions and features, ready for installation into a compatible engine build. Hardware such as wrist pins and rings are included as part of the piston set.