Clutch Masters FX350 Single Disc Clutch Kit 06-09 Legacy / 04-21 STI | 110% Holding Capacity Increase | Street/Race Clutch Kit
Overview
The Clutch Masters FX350 Single Disc Clutch Kit is engineered for Subaru enthusiasts driving 2006-2009 Legacy and 2004-2021 WRX STI models who demand a robust clutch capable of handling serious street and occasional track use. Designed to support highly tuned naturally aspirated engines with cylinder head modifications or medium-boost turbo and supercharger setups, this clutch kit offers a significant 110% increase in holding capacity over stock. It is also suitable for vehicles running up to 100 horsepower of nitrous oxide, making it a versatile upgrade for performance-focused Subaru owners.
At the core of the FX350 system is the Power Plus I heavy-duty pressure plate paired with Clutch Masters’ proprietary Fiber-Tough friction material. This combination balances durability and drivability, closing the traditional gap between long-lasting organic clutches and aggressive performance units. The slightly more aggressive engagement compared to the FX300 model results in some chatter, reflecting its race-inspired design philosophy tailored for enthusiasts who prioritize performance without sacrificing street manners entirely.
For Subaru owners, this clutch kit translates to improved power transfer and reliability under demanding conditions. Whether pushing a tuned Legacy or WRX STI on the street or track, the FX350 ensures consistent engagement and enhanced holding power, supporting modifications that increase engine output while maintaining a manageable pedal feel. This makes it an ideal choice for those who want a durable, high-performance clutch without compromising everyday usability.
Features & Specifications
This Clutch Masters FX350 Single Disc Clutch Kit is engineered specifically for 2006-2009 Legacy and 2004-2021 WRX STI platforms and features a heavy-duty Power Plus I pressure plate with Fiber-Tough friction material. Constructed from high-quality steel and organic Kevlar composites, it delivers a 110% increase in holding capacity for Subaru enthusiasts seeking a street and race-ready clutch solution.
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Brand: Clutch Masters
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Product: FX350 Single Disc Clutch Kit
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Part Number: 15017-HDFF
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Fitment: 2006-2009 Legacy / 2004-2021 WRX STI
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Material: Steel pressure plate, Fiber-Tough organic/Kevlar friction disc
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Finish: Natural steel with friction material coating
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Construction: Heavy-duty segmented friction disc, sprung hub, marcel spring wafer
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Origin: Not specified
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Power Gains: Supports up to 110% increased holding capacity over OEM
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Engagement: Slightly more aggressive with some chatter
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Tuning Required: Recommended for highly tuned or boosted engines
Key Benefits
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Performance: Handles increased power from cams, medium-boost turbos, superchargers, and up to 100hp nitrous setups
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Durability: Fiber-Tough friction material extends clutch life beyond OEM organic options
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Engagement: Balanced aggressive engagement suitable for street and occasional track use
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Fitment: Designed specifically for Legacy and WRX STI models ensuring precise compatibility
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Quality: Heavy-duty pressure plate and sprung hub improve reliability under high load
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Value: Combines street drivability with race-capable holding power in one kit
What's Included
- 1× Clutch Masters FX350 Single Disc Clutch Kit
- Power Plus I Heavy-Duty Pressure Plate
- Steel Backed Segmented Fiber-Tough Friction Disc
- Heavy-Duty Sprung Hub (when applicable)
- Marcel Spring Wafer
- OEM or Better Release Bearing
- Pilot Bearing (when applicable)
- Alignment Tool
- Instruction Card
- Decals
Installation & Compatibility
Installation of the FX350 clutch kit requires moderate mechanical skill and proper tools, including a clutch alignment tool provided in the kit. While a knowledgeable enthusiast with experience in Subaru drivetrains may perform the swap, professional installation is recommended to ensure correct setup and to avoid premature wear. This clutch is designed for specific Legacy and WRX STI model years listed and requires verification of fitment for your exact year and trim. Due to its more aggressive engagement and increased holding capacity, tuning adjustments to engine management or driveline components may be necessary to optimize performance and drivability.
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Professional Installation: Recommended
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Modifications Required: None beyond standard clutch replacement procedures
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Verify Compatibility: Confirm fitment for your specific year and trim level
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