Clutch Masters 725 PRO Series Triple Disc Clutch Kit & Flywheel 06-09 Legacy / 04-21 STI | 900 ft.lbs Torque Capacity | High-Performance Drivetrain Upgrade
Overview
The Clutch Masters 725 PRO Series Triple Disc Clutch Kit & Flywheel is a purpose-built conversion kit designed for the 2006-2009 Subaru Legacy and 2004-2021 Subaru WRX STI. This kit replaces the OEM clutch and flywheel setup with a robust multi-disc system engineered to handle significantly higher torque loads and provide superior engagement for high horsepower and race applications. It is specifically designed to work exclusively with the Clutch Masters flywheel, making it a comprehensive drivetrain upgrade for enthusiasts seeking enhanced durability and performance.
Clutch Masters has redefined their FX 725 line with the PRO Series, incorporating extensive engineering improvements based on over 15 years of racing and enthusiast feedback. The standout feature is the upgrade from a 6-post aluminum pressure plate to a 12-post 4140 heat-treated steel design, which dramatically increases structural integrity and resistance to flex under extreme stress. Manufactured entirely in the USA, this clutch kit reflects Clutch Masters’ commitment to quality, precision, and motorsport-grade reliability.
For Subaru owners pushing the limits of their Legacy or WRX STI, this triple disc clutch kit offers a significant step up in torque capacity—estimated at 900 ft.lbs—while maintaining smooth engagement and consistent performance under heat and abuse. The billet aluminum or steel flywheels are crafted to meet rigorous SFI safety standards, ensuring both street and track readiness. This setup is ideal for those running high-boost, built engines, or demanding race conditions where OEM components fall short.
Features & Specifications
This Clutch Masters 725 PRO Series Triple Disc Clutch Kit & Flywheel is engineered for 2006-2009 Legacy and 2004-2021 WRX STI platforms and features a triple ceramic rigid disc design with a 12-post steel pressure plate. Constructed from heat-treated 4140 steel and billet 6061-T6 aluminum or 1045 steel flywheels, it delivers exceptional torque capacity and durability for Subaru enthusiasts seeking a high-performance drivetrain upgrade.
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Brand: Clutch Masters
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Product: 725 PRO Series Triple Disc Clutch Kit & Flywheel
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Part Number: 15017P3D7RSHV
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Fitment: 2006-2009 Legacy / 2004-2021 STI
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Material: 4140 Heat-Treated Steel (Pressure Plate), Billet 6061-T6 Aluminum or 1045 Steel (Flywheel)
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Finish: Type 3 Hard Coat Anodized (Aluminum Flywheel), Black Oxide Treated (Steel Flywheel)
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Construction: CNC Machined and Assembled in USA
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Origin: Made in USA
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Torque Capacity: 900 ft.lbs (Estimated)
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Clutch Type: Triple Ceramic Rigid Disc
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SFI Certification: Yes
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Flywheel Compatibility: Exclusive to Clutch Masters Flywheel (OEM Flywheel Not Compatible)
Key Benefits
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Durability: 12-post steel pressure plate resists flex and wear under high torque and heat, extending clutch life in demanding conditions.
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Performance: Triple disc ceramic design provides increased torque capacity and improved engagement for high horsepower Legacy and STI builds.
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Fitment: Designed specifically for 06-09 Legacy and 04-21 STI, ensuring precise compatibility and reliable operation with Clutch Masters flywheel.
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Quality: Made entirely in the USA with CNC machining and rigorous quality control for consistent, race-proven performance.
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Safety: SFI certification meets motorsport standards, providing confidence for both street and track use.
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Heat Resistance: Ceramic rigid discs and heat-treated steel components maintain clutch integrity under extreme thermal stress.
What's Included
- 1× Clutch Masters 725 PRO Series Triple Disc Clutch Kit (Triple Ceramic Rigid Discs)
- 1× Clutch Masters Flywheel (Aluminum or Steel, application-specific)
- Mounting hardware for clutch and flywheel installation
- Installation instructions
Installation & Compatibility
Installation of the Clutch Masters 725 PRO Series Triple Disc Clutch Kit & Flywheel requires moderate to advanced mechanical skills and is recommended to be performed by a professional technician familiar with Subaru drivetrains. Special tools such as a clutch alignment tool and torque wrench are necessary for proper installation. This kit is a conversion that will not work with the OEM flywheel; it must be used exclusively with the included Clutch Masters flywheel. Tuning adjustments may be required for vehicles with modified engine management or increased power levels to optimize clutch engagement and drivability.
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Professional Installation: Recommended
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Modifications Required: Flywheel replacement mandatory; clutch hydraulic system inspection advised
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Verify Compatibility: Confirm fitment for your specific year and trim level of Legacy or WRX STI
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