• Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
  • Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)
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Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)

Manley 99.5mm STD Stroke 9.8:1 Dish Piston | Subaru WRX STI (04+) (612100C-1)

612100C-1

In stock

$169.89 USD
$190.01 USD $169.89 USD
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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 offer exceptional strength and durability for demanding applications. They feature proven cam and barrel skirt profiles, moly skirt coatings on select part numbers, and tool steel wrist pins to ensure reliable operation under high stress. These pistons are engineered to provide consistent compression and improved combustion efficiency, making them ideal for both stock and upgraded engine builds. Their robust construction and precision manufacturing deliver enhanced performance, longevity, and resistance to wear, supporting high horsepower and boost levels.

Designed for 2011–2025 Subaru WRX STI models equipped with the EJ257 engine, these pistons serve as a direct replacement for stock components. They are suitable for street, track, and high-performance tuning applications where durability and performance are critical. Installation involves standard piston replacement procedures, and the kit includes a single piston with all necessary components. These pistons are perfect for enthusiasts seeking reliable, high-quality parts to maximize engine output and longevity in demanding driving conditions.

Overview

Manley Performance

Fitment Summary

Part #: 612100C-1

Overview

The Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston is a high-performance engine component designed for serious tuners and engine builders seeking durability and reliable power support. Crafted from premium 2618 alloy forging, these pistons are engineered to withstand the rigors of high-performance applications while maintaining precise fitment and consistent operation. Ideal for enthusiasts aiming to enhance their Subaru's engine response, these pistons contribute to improved combustion efficiency and overall engine longevity, making them a trusted choice for both daily drivers and competitive builds.

Key Features

Built with performance and durability in mind, these pistons feature:

  • High-strength 2618 alloy forging for superior toughness
  • Proven cam and barrel skirt profiles for optimal stability
  • Tool steel wrist pins for enhanced durability under high loads
  • Moly skirt coatings on select part numbers to reduce friction and wear
  • Standard bore and stroke dimensions tailored for EJ257 engines
  • Designed to support high-performance tuning and modifications
  • Precision-machined for perfect fitment and reliable operation

Construction & Design

These pistons are crafted from premium 2618 alloy forging, known for its excellent strength-to-weight ratio and thermal stability. The moly skirt coatings help reduce friction and improve wear resistance, ensuring long-term durability. The design incorporates proven cam and barrel skirt profiles to promote stable piston movement and minimize piston slap, even under aggressive driving conditions.

Performance & Driving Experience

Engineered to support high-performance applications, these pistons help optimize combustion efficiency and power output. Their robust construction ensures consistent response and durability, whether you're pushing your Subaru WRX STi on the street or at the track. The precise fitment and high-quality materials contribute to a smoother, more reliable driving experience with enhanced engine responsiveness.

Installation & Fitment

Designed specifically for the EJ257 engine found in 2004 and newer Subaru WRX STi models, 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 product includes a set of single pistons designed for standard bore and stroke applications, with the necessary components for installation.

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