Clutch Masters FX400 6 Puck Single Disc Clutch Kit 18-21 WRX | 170% Holding Capacity Increase | High-Performance Clutch Kit
Overview
The Clutch Masters FX400 6 Puck Single Disc Clutch Kit is engineered for Subaru WRX models from 2018 to 2021, delivering a significant 170% increase in holding capacity over stock clutches. Designed for enthusiasts who demand both street drivability and track-ready performance, this clutch kit offers aggressive engagement with a ceramic puck disc that excels in high-torque applications. It’s ideal for drivers seeking a clutch that balances daily usability with race-level durability and precision.
Built around Clutch Masters’ Short Shift (SS) series billet aluminum clutch cover, the FX400 kit benefits from decades of engineering experience. The design focuses on reducing rotating mass and improving shift speed without sacrificing pedal feel or reliability. The kit retains compatibility with factory hydraulics and OE-style flywheels, making it a direct upgrade that enhances performance while maintaining a familiar driving experience.
For Subaru owners, this clutch kit transforms the driving experience by providing faster, more precise shifts and a consistent pedal feel under demanding conditions. The sprung ceramic disc design offers moderate dampening to reduce harsh engagement, making it more street-friendly than solid puck clutches. This balance ensures that whether on the street or the track, your WRX can handle increased power and aggressive driving with confidence.
Features & Specifications
This Clutch Masters FX400 6 Puck Single Disc Clutch Kit is engineered for Subaru WRX (2018-2021) and features a heavy-duty sprung ceramic 6-puck disc for rapid engagement and high holding capacity. Constructed with billet aluminum and premium ceramic friction material, it delivers aggressive performance and durability for Subaru enthusiasts seeking a race-capable yet street-usable clutch upgrade.
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Brand: Clutch Masters
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Product: FX400 6 Puck Single Disc Clutch Kit 18-21 WRX
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Part Number: 15915-HDC6
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Fitment: 2018-2021 Subaru WRX
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Material: Billet Aluminum Cover, Ceramic Friction Disc
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Finish: Natural Billet Aluminum
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Construction: CNC Machined Cover, Sprung Ceramic Disc
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Origin: Made in USA
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Power Gains: 170% Increase in Holding Capacity
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Tuning Required: Recommended for optimal performance
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Engagement: Aggressive, quick engagement with slight chatter
Key Benefits
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Performance: Handles significantly increased torque for aggressive driving and power upgrades
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Durability: Premium ceramic friction material and sprung hub design improve heat dissipation and clutch life under high stress
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Fitment: Direct bolt-on for 2018-2021 WRX using OE-style flywheels and factory hydraulics
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Engagement: Rapid clutch engagement with a consistent pedal feel optimized for both street and track use
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Weight Savings: 10% lighter billet aluminum cover reduces rotating mass for quicker throttle response
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Street Compatibility: Sprung hub design moderates clutch chatter compared to solid puck discs, improving drivability
What's Included
- 1× Clutch Masters FX400 6 Puck Single Disc Clutch Kit
- Short Shift Billet Aluminum Clutch Cover
- Sprung Ceramic 6-Puck Clutch Disc
- Heavy-Duty Pressure Plate
- New Throw Out Bearing designed for short throw
- Pilot Bearing (if applicable)
- Alignment Tool
- Instruction Card
- Decals
Installation & Compatibility
Installation of the FX400 clutch kit requires moderate mechanical skill and is best performed by a professional or 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 performance. No major modifications are necessary, but proper alignment and break-in procedures are critical to ensure longevity and smooth operation. Tuning is recommended to complement the increased holding capacity and aggressive engagement characteristics.
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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 transmission
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