Clutch Masters 850 PRO Series Twin Disc Clutch Kit & Flywheel 06-09 Legacy / 04-21 STI | 8.5" Twin Disc | High-Performance Clutch Kit
Overview
The Clutch Masters 850 PRO Series Twin Disc Clutch Kit & Flywheel is a high-performance conversion kit designed specifically for the 2006-2009 Subaru Legacy and 2004-2021 Subaru WRX STI platforms. This kit replaces the OEM flywheel and clutch assembly with a purpose-built system engineered to handle extreme torque and aggressive driving conditions. It is ideal for enthusiasts seeking a durable, race-ready clutch solution that delivers consistent engagement and improved drivetrain reliability.
Built as the next evolution of Clutch Masters’ multi-disc clutch technology, the 850 PRO Series features a completely redesigned 8.5-inch clutch system. The kit incorporates a 12-post heat-treated 4140 steel pressure plate, a next-generation driven hub, and ceramic friction discs that provide superior strength and heat resistance. This design addresses common weaknesses found in traditional setups by eliminating flex and wear under high-stress conditions, making it a standout choice for both street and track use.
Real-world benefits for Subaru owners include enhanced torque capacity rated at an estimated 800 ft-lbs, reduced spline wear thanks to the precision-driven hub, and the option to choose between lightweight 6061-T6 billet aluminum or ultra-strong 4140 billet steel flywheels. This clutch system is fully serviceable with available rebuild kits, ensuring long-term reliability and performance for demanding Subaru builds.
Features & Specifications
This Clutch Masters 850 PRO Series Twin Disc Clutch Kit & Flywheel is engineered for the 2018-2021 Subaru WRX STI and 2006-2009 Legacy, featuring an 8.5-inch twin ceramic disc setup. Constructed from heat-treated 4140 steel and billet aluminum or steel flywheels, it delivers exceptional torque capacity and durability for Subaru enthusiasts seeking race-grade clutch performance.
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Brand: Clutch Masters
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Product: 850 PRO Series Twin Disc Clutch Kit & Flywheel
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Part Number: 15017PTD8RSHV
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Fitment: 2018-2021 Subaru WRX STI, 2006-2009 Subaru Legacy
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Material: Heat-treated 4140 steel, 6061-T6 billet aluminum or 4140 billet steel flywheel
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Finish: Type 3 hard coat anodized (aluminum flywheel), black oxide treated (steel flywheel)
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Construction: 12-post pressure plate, ceramic friction discs, billet flywheel
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Origin: Made in USA
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Torque Capacity: Estimated 800 ft-lbs
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Engagement: Available in Sprung Race (1 sprung ceramic disc + 1 ceramic disc) and Rigid Race (2 ceramic discs with rigid hub)
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Flywheel Options: 6061-T6 billet aluminum or 4140 billet steel
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Serviceability: Fully serviceable with rebuild kits available
Key Benefits
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Performance: Handles extreme torque loads up to 800 ft-lbs, ideal for high horsepower Subaru builds
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Durability: Heat-treated 4140 steel pressure plate and ceramic discs resist wear and heat fade
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Fitment: Designed exclusively for Clutch Masters flywheel, ensuring precise compatibility and installation
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Engagement: Next-generation driven hub reduces spline wear and provides consistent clutch feel
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Adjustability: Choice between sprung and rigid disc configurations to match driving style and application
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Quality: Proudly manufactured in the USA with race team input and rigorous quality control
What's Included
- 1× Clutch Masters 850 PRO Series Twin Disc Clutch Assembly
- 1× Clutch Masters Billet Flywheel (aluminum or steel, depending on selection)
- Mounting hardware for clutch and flywheel installation
- Installation instructions
Installation & Compatibility
Installation of the Clutch Masters 850 PRO Series Twin Disc Clutch Kit & Flywheel requires professional expertise due to the precision alignment and torque specifications involved. Special tools such as a clutch alignment tool and torque wrench are recommended. This kit is a conversion that will not work with the OEM flywheel and must be used exclusively with the Clutch Masters flywheel included. Tuning adjustments may be necessary to optimize drivability and engagement characteristics after installation.
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Professional Installation: Recommended
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Modifications Required: Conversion kit; OEM flywheel incompatible
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Verify Compatibility: Confirm fitment for your specific year and trim level of Subaru WRX STI or Legacy
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