Action Clutch Stage 1 Clutch Kit

2004–2021 Subaru WRX STI 2.5L DOHC EJ257 Turbo AWD

Part #: ACR-1802

Overview

The Action Clutch Stage 1 Clutch Kit is designed to enhance the performance and durability of your Subaru WRX STI equipped with the EJ257 2.5L turbocharged engine. Built for enthusiasts seeking a reliable upgrade, this clutch kit offers increased holding capacity while maintaining the factory-like driving experience. Whether you're daily driving, spirited street use, or light track days, this clutch provides a perfect balance of performance and drivability.

With its reinforced organic sprung system, the Stage 1 clutch delivers a significant boost in clamping force—up to 50% more than stock—allowing your vehicle to handle increased power and torque with confidence. The organic friction material ensures smooth engagement and a light pedal feel, making it an ideal choice for drivers who want improved performance without sacrificing comfort or ease of use.

Key Features

The Action Clutch Stage 1 Clutch Kit incorporates several advanced features to optimize your vehicle's clutch performance:

• Reinforced steel-backed organic clutch disc for increased durability and heat resistance during aggressive driving.
• Single diaphragm heavy-duty pressure plate that provides consistent engagement and reliable holding capacity.
• Organic sprung hub design that ensures smooth, linear pedal feel and reduces chatter during engagement.
• 50% increase in holding capacity compared to OEM clutch, supporting moderate power upgrades and spirited driving.
• Engineered for OEM-like pedal pressure, making installation and daily driving comfortable and familiar.
• Designed specifically for the Subaru WRX STI 2004-2021 with the EJ257 engine, ensuring perfect fitment and performance.
• Constructed with high-quality materials to withstand the rigors of performance driving while maintaining long service life.
• Manufactured by Action Clutch, a trusted name in performance clutch systems, ensuring quality and reliability.

Construction & Design

The Action Clutch Stage 1 Clutch Kit features a meticulously engineered organic friction material mounted on a reinforced steel-backed disc. This combination provides excellent heat dissipation and wear resistance, ensuring consistent performance over time. The heavy-duty pressure plate employs a single diaphragm design, which offers a robust clamping force while maintaining a light pedal feel. The sprung hub design absorbs torsional vibrations, resulting in smoother engagement and reduced driveline shock.

The entire assembly is built with precision CNC-machined components and TIG-welded for durability and exact fitment. The organic friction material is optimized for street and light track use, providing a quiet, smooth operation that complements the factory drivetrain characteristics. This thoughtful construction ensures your clutch system can handle increased power levels while preserving the OEM-like feel and reliability.

Installation & Fitment

This clutch kit is designed as a direct bolt-on replacement for the factory clutch in your Subaru WRX STI from 2004 to 2021 with the EJ257 engine. No cutting, drilling, or complex modifications are required for installation. Basic mechanical skills and standard tools are sufficient to complete the swap. It is recommended to replace the clutch release bearing and pilot bearing during installation to ensure optimal performance and longevity.

• Designed for easy installation with OEM mounting points and hardware.
• No special tuning or adjustments are necessary post-installation.
• Proper break-in procedures are recommended to maximize clutch life and performance.

What's Included

• Reinforced organic sprung clutch disc
• Heavy-duty single diaphragm pressure plate
• Alignment tool
• Clutch release bearing
• Installation hardware and instructions

Ideal For

• Subaru WRX STI owners seeking a reliable upgrade for increased clamping force
• Enthusiasts performing moderate power modifications
• Drivers who want a smooth, OEM-like pedal feel with enhanced durability
• Street and light track use where improved holding capacity is desired