SPEC Stage 2+ Clutch Kit

2004–2009 Subaru Impreza WRX STI 2.0L

Part #: SU303H

Overview

The SPEC Stage 2+ Clutch Kit is designed specifically for Subaru WRX STI models from 2004 to 2009, delivering a perfect balance of performance, durability, and drivability. Whether you're a spirited street driver, a weekend enthusiast, or an off-road adventurer, this clutch kit enhances your vehicle's ability to handle increased power and torque while maintaining smooth engagement and reliable operation.

Built for those seeking a significant upgrade over stock components, the Stage 2+ offers a noticeable improvement in clutch response and holding capacity. It bridges the gap between the standard Stage 2 and more aggressive Stage 3 setups, making it an ideal choice for drivers who want more performance without sacrificing daily drivability.

Key Features

The SPEC Stage 2+ Clutch Kit incorporates advanced materials and engineering to ensure maximum performance and longevity. Its multi-friction disc features a full-faced design with a carbon semi-metallic surface on one side and Kevlar on the other, providing excellent heat resistance, friction stability, and consistent engagement. This combination helps support increased torque capacity—approximately 15-20% higher than the stock clutch—making it suitable for moderate upgrades, tuning, or spirited driving.

• Multi-friction disc with carbon semi-metallic and Kevlar surfaces for enhanced durability and heat resistance
• Full-faced clutch disc for even pressure distribution and smooth engagement
• Sprung hub (application dependent) with double-sprung design and spring cover for improved shock absorption and reduced driveline shock
• Heat-treated components for increased strength and longevity under demanding conditions
• Heavy-duty pressure plate engineered for consistent clamping force and reliable power transfer
• Designed to support increased torque and horsepower gains while maintaining OEM-like drivability

Construction & Design

The SPEC Stage 2+ Clutch Kit features a high-quality, heat-treated steel pressure plate and a multi-friction disc assembly that ensures reliable performance under demanding conditions. The clutch components are engineered with precision to provide a perfect fit and smooth operation, reducing pedal effort and chatter. The use of advanced friction materials and robust construction techniques ensures the clutch can withstand the rigors of spirited driving and moderate tuning modifications.

Installation & Fitment

The SPEC Stage 2+ Clutch Kit is a bolt-on upgrade that requires no modifications to your vehicle's existing components. It is designed to fit directly onto the factory flywheel and transmission, making installation straightforward for experienced DIY enthusiasts or professional technicians. No cutting, drilling, or tuning is typically required, but a proper clutch alignment and bedding procedure are recommended to maximize performance and lifespan.

• Direct bolt-on installation
• No cutting or drilling necessary
• Compatible with OEM flywheel and transmission
• Recommended to follow bedding procedure for optimal performance

What's Included

• Full clutch disc with multi-friction surfaces
• Heavy-duty pressure plate
• Release bearing
• Alignment tool
• Installation hardware and instructions

Ideal For

• Subaru WRX STI owners seeking increased torque capacity
• Drivers upgrading from stock clutch for better performance
• Enthusiasts wanting a reliable, street-friendly clutch with improved engagement
• Moderate tuning and power modifications