• Manley 99.75mm STD Stroke +.25mm Bore Dish Piston Set | Subaru WRX STi (04+) (612102C-4)
  • Manley 99.75mm STD Stroke +.25mm Bore Dish Piston Set | Subaru WRX STi (04+) (612102C-4)
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Manley 99.75mm STD Stroke +.25mm Bore Dish Piston Set | Subaru WRX STi (04+) (612102C-4)

Manley 99.75mm STD Stroke +.25mm Bore Dish Piston Set | Subaru WRX STi (04+) (612102C-4)

612102C-4

In stock

$699.23 USD
$760.03 USD $699.23 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 ensure optimal engine performance and durability. Equipped with tool steel wrist pins and moly skirt coatings on select part numbers, they provide excellent wear resistance and thermal stability. These pistons are engineered to deliver consistent power output and reliability under demanding conditions, making them ideal for professional engine builders and tuners seeking superior quality components.

Designed for the 2011–2025 Subaru WRX STI models equipped with the EJ257 engine, these pistons have a standard stroke of 99.75mm and a bore of 9.8:1 compression ratio with a dish design. They serve as a direct replacement or upgrade for stock pistons, suitable for high-performance applications including tuning and racing. The set includes pistons and rings, providing a comprehensive upgrade for enhanced engine strength and efficiency. These pistons are intended for use in street and track environments where durability and performance are critical.

Overview

Manley Performance Pistons

Fits 2004+ Subaru WRX STi with EJ257 Engine

Part #: 612102C-4

Overview

The Manley Platinum Series piston set is engineered for high-performance Subaru WRX STi enthusiasts and professional engine builders seeking durability and precision. Designed specifically for the EJ257 engine, these pistons feature a 99.75mm stroke and a +0.25mm bore, optimized for enhanced power output and reliability. Crafted from premium 2618 alloy forgings, they deliver superior strength and thermal stability, making them ideal for both daily driving and aggressive tuning applications. Whether you're rebuilding your engine or upgrading for increased performance, these pistons provide a reliable foundation for your build. Constructed with proven cam and barrel skirt profiles, the pistons ensure optimal ring sealing and reduced piston slap, contributing to smoother operation and longevity. The moly skirt coatings on select part numbers reduce friction and wear, supporting consistent performance over time. Equipped with tool steel wrist pins, these pistons are built to withstand high loads and thermal stresses, making them suitable for high-horsepower applications.

Key Features

Designed with high-quality materials and precision engineering, the Manley Platinum Series pistons offer:
  • 2618 aluminum forging for exceptional strength and durability
  • Optimized 99.75mm stroke and +0.25mm bore for increased displacement
  • Tool steel wrist pins for enhanced load capacity
  • Moly skirt coatings on select models to reduce friction and wear
  • Proven cam and barrel skirt profiles for reliable sealing and performance
  • Engineered for high-performance Subaru EJ257 engines
  • Ideal for rebuilds, tuning, and performance upgrades

Construction & Design

These pistons are crafted from high-grade 2618 alloy forgings, known for their excellent strength-to-weight ratio and thermal properties. The design incorporates proven skirt profiles and moly coatings to minimize friction and enhance durability, ensuring consistent performance under demanding conditions. The tool steel wrist pins are precision-machined for a perfect fit, supporting high-stress operation and longevity.

Performance & Response

The Platinum Series pistons are engineered to support increased engine displacement and power output while maintaining reliable operation. Their robust construction helps improve throttle response and overall engine responsiveness, making them suitable for both street and track use. The optimized design ensures efficient combustion and heat management, contributing to a more responsive driving experience.

Installation & Fitment

These pistons are designed for straightforward installation in compatible EJ257 engines. Proper assembly requires standard engine rebuilding procedures, including bore sizing and ring installation. Professional installation is recommended to ensure optimal performance and longevity.

What’s Included

The package includes a complete set of pistons with rings and wrist pins, ready for installation in your Subaru WRX STi engine.
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