Clutch Masters FX350 Single Disc Clutch Kit 18-21 WRX | 110% Holding Capacity Increase | Street/Race Clutch Kit
Overview
The Clutch Masters FX350 Single Disc Clutch Kit is engineered specifically for the 2018-2021 Subaru WRX, delivering a substantial 110% increase in holding capacity over stock clutches. Designed for enthusiasts who demand a balance between street drivability and track-ready performance, this clutch kit offers a lighter rotating mass and a consistent pedal feel that supports faster, more precise shifts. Whether you’re daily driving or pushing your WRX on the weekend track, the FX350 provides the durability and engagement needed for highly tuned naturally aspirated or medium-boost turbocharged setups.
Built around Clutch Masters’ Short Shift (SS) series billet aluminum clutch cover, this kit benefits from decades of engineering experience, including insights gained from their twin disc systems. The design philosophy focuses on maintaining an OE-style clutch cover fitment while enhancing clamping force and pedal feel. The heavier diaphragm spring and modified pivot point deliver a pedal effort that is only slightly heavier than stock, ensuring the clutch remains street-friendly without sacrificing performance.
For Subaru WRX owners, the FX350 clutch kit translates to improved power handling for cars with cylinder head modifications, cams, or moderate forced induction, including setups with up to 100 horsepower of nitrous oxide. The Fiber-Tough friction material bridges the gap between longevity and aggressive engagement, making it ideal for those who want a clutch that performs reliably under spirited driving conditions without excessive chatter or harshness.
Features & Specifications
This Clutch Masters FX350 Single Disc Clutch Kit is engineered for Subaru WRX platforms from 2018 to 2021 and features a billet aluminum Short Shift clutch cover with Fiber-Tough friction material. Constructed from high-quality steel and aluminum components, it delivers increased clamping force and reduced rotating mass for enthusiasts seeking enhanced street and track performance.
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Brand: Clutch Masters
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Product: FX350 Single Disc Clutch Kit 18-21 WRX
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Part Number: 15915-HDFF
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Fitment: 2018-2021 Subaru WRX
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Material: Billet Aluminum Cover, Steel Pressure Plate, Fiber-Tough Friction Disc
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Finish: Natural Aluminum and Steel
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Construction: CNC Machined Billet Cover, Heavy-Duty Pressure Plate
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Origin: Not Specified
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Power Gains: Supports up to +100 HP Nitrous or Medium-Boost Turbo
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Tuning Required: Recommended for optimal performance
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Engagement: Slightly Aggressive with Some Chatter
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Clutch Cover Type: Short Shift Billet Aluminum
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Disc Material: Fiber-Tough Segmented Friction
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Compatibility: Fits OE Style Single Disc Flywheels
Key Benefits
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Performance: 110% increase in holding capacity for enhanced power handling on tuned WRX engines
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Durability: Fiber-Tough friction material balances longevity with aggressive engagement for street and track use
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Pedal Feel: Modified pivot point and heavier diaphragm provide consistent, slightly heavier pedal effort without fatigue
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Fitment: Designed to fit OE style single disc flywheels and factory hydraulic systems for straightforward installation
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Weight Savings: 10% lighter than OEM stamped steel cover, reducing rotating mass for quicker engine response
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Shift Quality: Shorter, faster, and more precise shifts improve driving experience on both street and track
What's Included
- 1× Clutch Masters FX350 Single Disc Clutch Kit
- Short Shift Billet Aluminum Clutch Cover
- Fiber-Tough Segmented Friction Disc
- Heavy-Duty Sprung Hub (if applicable)
- OEM or Better Release Bearing
- Pilot Bearing (if applicable)
- Alignment Tool
- Instruction Card
- Decals
Installation & Compatibility
Installation of the FX350 clutch kit requires moderate mechanical skill and is best performed by a professional or an experienced enthusiast. The kit is designed to work with factory hydraulic systems, though Clutch Masters recommends upgrading to their internal hydraulic release bearing and master cylinder for optimal clutch feel and performance. No major modifications are necessary as the kit fits OE style single disc flywheels. Proper break-in procedures and tuning adjustments are advised to maximize clutch life and engagement quality.
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Professional Installation: Recommended
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Modifications Required: None; compatible with stock flywheel and hydraulics
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Verify Compatibility: Confirm fitment for your specific WRX model year and trim
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