Action Clutch Chromoly Lightweight Flywheel

Fitment: Subaru WRX STI 04-21

Part #: AC117FW

Overview

The Action Clutch Chromoly Lightweight Flywheel is a high-performance upgrade designed specifically for Subaru WRX STI models from 2004 to 2021. Crafted from durable chromoly steel, this flywheel is engineered to withstand extreme use in both street and race applications. Its lightweight design reduces rotational mass, resulting in quicker engine response and more precise throttle control. Whether you're building a high-tuned street machine or a dedicated track car, this flywheel helps optimize your vehicle’s power delivery and responsiveness, enhancing overall driving engagement and performance durability.

Key Features

Designed to improve engine response and reduce rotational inertia, the Action Clutch Chromoly Lightweight Flywheel offers several practical benefits:

• Constructed from high-strength chromoly steel for increased durability and heat resistance
• Precisely machined for a perfect fit and smooth operation
• Heat-treated to withstand high RPMs up to 18,000 RPM without deformation
• Resurfacable for long-term maintenance and performance consistency
• Reduces rotational weight for quicker throttle response and improved acceleration
• Supports high-performance driving with reliable structural integrity
• Designed for easy installation with compatible Subaru WRX STI models

Construction & Design

This flywheel features a robust chromoly steel construction, known for its excellent strength-to-weight ratio and heat dissipation properties. The precision machining ensures a balanced, smooth surface that promotes consistent clutch engagement and longevity. Its heat treatment process enhances durability, making it suitable for high-RPM applications and aggressive driving styles.

Driving Feel & Feedback

The lightweight design significantly improves engine response, providing a more immediate throttle feel and sharper acceleration. Drivers will notice a more direct connection between the engine and the drivetrain, especially during high-rev shifts and spirited driving. The flywheel’s stability and resilience contribute to a confident, engaging driving experience.

Installation & Fitment

Installation requires standard mechanical skills and should be performed with proper tools. Fitment is specific to Subaru WRX STI models from 2004 to 2021; verification against your vehicle’s specifications is recommended to ensure compatibility.

What’s Included

The package includes the chromoly lightweight flywheel ready for installation, with all necessary hardware for a secure fitment.