SPEC Clutch

2004–2009 Subaru WRX STI 2.0L Turbo

Part #: SU305

Overview

The SPEC Stage 5 Clutch Kit for the Subaru WRX STI is engineered for enthusiasts seeking maximum performance and durability. Designed specifically for the 2004-2009 models, this high-performance clutch kit is ideal for extreme street driving, drag racing, and other demanding applications. Whether you're pushing your vehicle to its limits on the track or looking for a reliable upgrade for spirited daily driving, this clutch kit delivers exceptional holding capacity and a firm pedal feel.

Built to support high horsepower and torque levels, the Stage 5 kit features a full-metallic disc that provides the highest possible friction coefficient. This results in improved clutch engagement, better power transfer, and enhanced overall performance. While it is street drivable, it is not recommended for everyday street use due to its aggressive nature, making it perfect for race-ready setups.

Key Features

The SPEC Stage 5 Clutch Kit incorporates advanced materials and engineering to meet the demands of high-performance driving. Here are some of its standout features:

• Full-metallic Disc: Utilizes a full-metallic friction surface for maximum grip and durability under extreme conditions.
• High Torque Capacity: Supports up to 772 ft-lbs of torque, making it suitable for heavily modified engines and high-horsepower builds.
• Solid Hub Construction: Features a 12-rivet hub for enhanced strength and heat dissipation during aggressive driving.
• Heat-Treated Assembly: Ensures long-lasting performance and resistance to warping or failure under high stress.
• Improved Engagement: Provides a more direct and responsive pedal feel, giving you better control during shifts.
• Durability: Designed to withstand the rigors of drag racing and high-performance street use.
• Compatibility: Specifically engineered for the Subaru WRX STI 2.0L turbocharged engines from 2004 to 2009.

Construction & Design

The Stage 5 Clutch Kit features a meticulously engineered full-metallic friction disc that maximizes grip while maintaining reliable engagement. The hub is constructed with 12 rivets, providing a robust connection that can handle extreme torque loads. The entire assembly is heat-treated to ensure durability and resistance to thermal stress, which is critical during high-performance applications. The pressure plate is designed to deliver consistent clamping force, ensuring reliable power transfer and minimal slip even under demanding conditions. Overall, the kit combines high-quality materials with precision manufacturing to deliver a clutch that can handle the rigors of racing while maintaining a level of streetability.

Installation & Fitment

This clutch kit is a bolt-on upgrade designed specifically for the 2004-2009 Subaru WRX STI models. Installation requires basic mechanical skills and proper alignment procedures. Due to its aggressive nature and high torque capacity, some users may need to upgrade their flywheel or consider additional drivetrain modifications for optimal performance. No cutting or drilling is required, but it is recommended to have a professional installation to ensure proper setup and maximum longevity. Tuning or adjustments are generally not necessary, but a proper break-in period is advised for optimal performance and longevity.

• Includes all necessary components for a complete clutch replacement, including the pressure plate, full-metallic disc, and release bearing.

What's Included

• Stage 5 high-performance clutch pressure plate
• Full-metallic friction disc
• Release bearing
• Installation hardware and instructions

Ideal For

• High-horsepower Subaru WRX STI owners
• Drag racers and track enthusiasts
• Performance tuners seeking maximum clutch capacity
• Drivers pushing their vehicle beyond stock power levels