Clutch Masters 850 Series Street Twin Disc Clutch Kit 06-09 Legacy / 04-21 STI | Twin Disc Design | High-Performance Clutch Kit
Overview
The Clutch Masters 850 Series Street Twin Disc Clutch Kit is engineered for Subaru Legacy (2006-2009) and WRX STI (2004-2021) models, delivering exceptional clutch performance for high horsepower and torque applications. This kit features an 8.5-inch twin disc setup designed to provide superior clamping force and consistent pedal feel, making it ideal for enthusiasts who demand both street drivability and track-capable engagement. The Street version (TD8S) combines a sprung ceramic disc with a fiber tuff rigid disc, balancing smooth operation with enhanced holding capacity.
Built with racing technology at its core, the FX850 clutch kit utilizes a billet aluminum pressure plate cover that is Type 3 hard anodized for durability and strength. This cover exhibits minimal flex—only .003 inches compared to up to .030 inches in cast or stamped units—ensuring that all clutch actuation force is efficiently applied to engage and disengage the clutch. The Quick Release (QR) system incorporated into the pressure plate uses spring-loaded bolts to reduce clutch noise and chatter by up to 50%, delivering a smoother and quieter driving experience without sacrificing performance.
For Subaru owners, this clutch kit means reliable power transfer and improved pedal feel, especially important when upgrading engine output or driving aggressively. The increased clamping force and larger friction surface area allow the clutch to handle elevated torque loads while maintaining manageable pedal effort, making it a practical upgrade for both spirited street driving and occasional track use.
Features & Specifications
This Clutch Masters 850 Series Street Twin Disc Clutch Kit is engineered for Subaru Legacy (06-09) and WRX STI (04-21) platforms and features an 8.5-inch twin disc design with a billet aluminum pressure plate cover. Constructed from high-strength billet aluminum and ceramic/fiber friction materials, it delivers superior clamping force and consistent engagement for Subaru enthusiasts seeking enhanced durability and performance.
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Brand: Clutch Masters
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Product: 850 Series Street Twin Disc Clutch Kit
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Part Number: 15017-TD8S-XW
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Fitment: 2018-2021 Subaru WRX STI
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Material: Billet Aluminum (Pressure Plate), Ceramic and Fiber Friction Discs
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Finish: Type 3 Hard Anodized (Pressure Plate Cover)
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Construction: CNC Machined Billet Cover, Sprung Ceramic and Fiber Discs
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Origin: Not Specified
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Clutch Diameter: 8.5 inches (216 mm)
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Disc Configuration: Twin Disc (1 Sprung Ceramic + 1 Fiber Tuff Rigid Disc)
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Pressure Plate Features: Quick Release (QR) System with Spring-Loaded Bolts
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Flywheel Options: Billet 6061-T6 Aluminum (SFI 1.2 Spec) or 1045 Steel
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Pedal Pressure: Approximately 50% increase over stock, balanced for street use
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Application Type: High-Performance Street and Track
Key Benefits
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Performance: Handles high horsepower and torque with increased clamping force for reliable power transfer.
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Durability: Billet aluminum pressure plate cover reduces flex for consistent clutch engagement and longer service life.
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Pedal Feel: Designed to maintain reasonable pedal pressure despite increased clamping force, improving drivability.
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Noise Reduction: Quick Release system reduces clutch chatter and noise by up to 50%, enhancing street comfort.
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Fitment: Tailored specifically for Subaru Legacy (06-09) and WRX STI (04-21) models ensuring direct compatibility.
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Quality: High-grade materials and precision machining deliver a premium clutch experience for Subaru enthusiasts.
What's Included
- 1× Clutch Masters 850 Series Street Twin Disc Clutch Kit
- 1× Billet Aluminum Pressure Plate with Quick Release System
- 1× Sprung Ceramic Clutch Disc
- 1× Fiber Tuff Rigid Clutch Disc
- 1× Flywheel (Aluminum or Steel, application-specific)
- Installation instructions
Installation & Compatibility
Installation of the Clutch Masters 850 Series Street Twin Disc Clutch Kit requires moderate mechanical skill and access to transmission removal tools. Professional installation is recommended to ensure proper clutch alignment and torque specifications. No major modifications are necessary for compatible Subaru Legacy and WRX STI models, but verify exact year and trim fitment before purchase. Tuning is not required for clutch operation; however, this clutch is designed to support higher power levels, so engine tuning may be necessary if power upgrades are planned.
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Professional Installation: Recommended
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific Subaru model year and trim
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