Manley Performance

Fits 98+ Subaru WRX with EJ205 engine

Part #: 620005C-4

Overview

The Manley Platinum Series piston set is designed for high-performance Subaru WRX engines, specifically for models with the EJ205 engine. Crafted with advanced materials and engineering, these pistons are ideal for enthusiasts and professional tuners seeking to enhance engine durability and power potential. Whether you're building a stroker engine or upgrading for increased displacement, these pistons provide a reliable foundation for your performance build. They are engineered to withstand the stresses of high-revving, forced induction applications while maintaining excellent thermal stability and wear resistance, ensuring your engine's longevity and consistent performance.

Key Features

Built from 2618 alloy forging for superior strength and ductility, these pistons feature proven cam and barrel skirt profiles optimized for high-performance applications. The moly skirt coatings reduce friction and wear, contributing to smoother operation and extended component life. Equipped with precision-machined tool steel wrist pins, these pistons deliver reliable attachment and minimal movement under demanding conditions. The dish design with an 8.5:1 compression ratio helps optimize combustion efficiency and power output, making them suitable for turbocharged setups. Designed with durability and performance in mind, these pistons are a perfect choice for serious engine builders.

Construction & Design

The Platinum Series pistons are manufactured from high-quality 2618 alloy forgings, known for their excellent strength-to-weight ratio and thermal properties. The carefully engineered cam and barrel skirt profiles promote optimal oil control and reduce piston slap, enhancing engine response. The moly skirt coatings provide a low-friction surface, reducing wear and improving efficiency during high-stress operation. The precision-machined wrist pins are made from durable tool steel, ensuring secure fitment and longevity.

Performance & Response

Designed to support increased displacement and boost levels, these pistons help improve engine response and power delivery. The dish design and compression ratio are tailored to maximize combustion efficiency, supporting higher boost pressures and fueling setups. They help maintain consistent compression and combustion stability, contributing to a more responsive and reliable engine.

Installation & Fitment

These pistons are engineered specifically for the 98+ Subaru WRX with the EJ205 engine, ensuring a direct fit for compatible engine builds. Proper installation requires standard engine assembly procedures and attention to clearances. It is recommended to consult with a professional engine builder or machinist for optimal results.

What’s Included

The package includes a set of four pistons with moly-coated skirts and matching rings, along with wrist pins and necessary hardware for installation.