• Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
  • Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
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Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)

Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)

622100C-4

In stock

$679.55 USD
$760.03 USD $679.55 USD
ADDITIONAL DISCOUNTS APPLIED AT CHECKOUT Sold out

The Manley Platinum Series pistons are high-performance forged components designed specifically for the Subaru WRX STI with the EJ257 engine. Crafted from 2618 alloy, these pistons feature proven cam and barrel skirt profiles to enhance strength and reliability under demanding conditions. Equipped with tool steel wrist pins and moly skirt coatings on select part numbers, they deliver superior durability and consistent performance. These pistons are engineered to support increased power output and improved engine response, making them ideal for high-performance applications and tuning projects. Their robust construction ensures longevity and resistance to wear, even under aggressive driving or track use.

Designed for 2011–2025 Subaru WRX STI models with the EJ257 engine, these 83mm stroker pistons are a direct upgrade for stock components. They are suitable for use in performance builds, whether for street, track, or racing environments. The set includes pistons and rings, providing a complete upgrade for engine rebuilds or enhancements. Installation involves replacing the stock pistons with these forged units, offering a reliable solution for enthusiasts seeking increased displacement and power. Compatibility with stock or aftermarket components makes them versatile for various tuning setups and performance goals.

Overview

Manley Performance Pistons

Fitment Summary

Part #: 622100C-4

Overview

The Manley 04+ Subaru WRX STi (EJ257) 83mm Stroker 99.5mm STD Bore 9.8:1 Dish Piston Set is a high-performance upgrade designed for serious engine builders and tuners seeking durability and enhanced power. Crafted from premium 2618 alloy forgings, these pistons are engineered to withstand the rigors of high-stress applications while supporting increased displacement and power output. Ideal for those looking to build a reliable, high-performance engine, this set offers a perfect balance of strength, weight reduction, and thermal stability, making it suitable for both daily driving and competitive racing. Whether you're rebuilding your engine or customizing your Subaru WRX STi for optimal performance, these pistons provide the foundation for a robust and responsive powertrain. The dish design helps maintain compression ratios suitable for forced induction setups, while the moly skirt coatings reduce friction and wear, extending engine life. The inclusion of proven cam and barrel skirt profiles ensures compatibility and reliable operation under demanding conditions.

Key Features

This piston set features advanced materials and thoughtful design to maximize engine performance and longevity:
  • Manufactured from high-quality 2618 alloy forgings for superior strength and durability
  • Designed with proven cam and barrel skirt profiles for optimal fit and function
  • Includes tool steel wrist pins for enhanced reliability and wear resistance
  • Moly-coated skirts to reduce friction and improve thermal management
  • Dish piston design to support suitable compression ratios for turbocharged applications
  • Precisely engineered to fit the EJ257 engine in Subaru WRX STi models from 2004 and newer

Construction & Design

The pistons are crafted from high-grade 2618 alloy forgings, known for their excellent strength-to-weight ratio and thermal stability. The moly skirt coatings provide a low-friction surface, reducing wear and improving efficiency during high-performance operation. The design incorporates a dish shape that helps maintain the desired compression ratio, essential for turbocharged engines, while the tool steel wrist pins ensure secure attachment and longevity.

Performance & Response

These pistons are engineered to support increased engine displacement and boost levels, helping your Subaru WRX STi achieve improved throttle response and power delivery. The lightweight forged construction reduces reciprocating mass, contributing to quicker engine response and smoother operation under high RPM conditions. Designed for durability, they help maintain consistent performance during aggressive driving or racing scenarios.

Installation & Fitment

This piston set is intended for use with the EJ257 engine found in 2004 and newer Subaru WRX STi models. Proper installation requires standard engine rebuilding procedures, including bore sizing and proper piston ring installation. It is recommended to consult with a professional engine builder for optimal results.

What’s Included

The package includes a complete set of four pistons, tool steel wrist pins, and piston rings designed specifically for the 83mm stroke and 99.5mm bore configuration.
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