Clutch Masters FX300 Single Disc Clutch Kit 18-21 WRX

Clutch Masters FX300 Single Disc Clutch Kit 18-21 WRX | 110% Increased Holding Capacity | Street Performance Clutch Kit

Overview

The Clutch Masters FX300 Single Disc Clutch Kit is engineered to deliver a significant upgrade in holding capacity and pedal feel for Subaru WRX models from 2018 to 2021. Designed specifically for street-driven enthusiasts who demand enhanced performance without sacrificing drivability, this clutch kit offers a perfect balance between aggressive engagement and daily usability. It is ideal for highly tuned naturally aspirated engines, medium-boost turbo setups, or supercharged applications up to approximately 100 horsepower on nitrous oxide.

Built around a billet aluminum clutch cover, the FX300 kit incorporates decades of clutch development experience, including insights from Clutch Masters’ renowned twin disc systems. The design focuses on reducing rotating mass and improving shift precision while maintaining a consistent and manageable pedal effort. The steel-backed segmented Kevlar disc provides durable friction material that is non-abrasive to flywheel surfaces, ensuring longevity and smooth engagement.

For Subaru owners, this clutch kit translates to shorter, faster shifts and increased torque capacity, making it a reliable upgrade for spirited street driving and moderate performance builds. Its compatibility with factory hydraulics and the availability of supporting hydraulic upgrades make it a practical choice for those looking to maximize their WRX’s potential without compromising everyday comfort.

Features & Specifications

This Clutch Masters FX300 Single Disc Clutch Kit is engineered for Subaru WRX (2018-2021) and features a heavy-duty billet aluminum clutch cover with a steel-backed segmented Kevlar disc. Constructed from premium materials, it delivers 110% increased holding capacity and a street-friendly pedal feel for Subaru enthusiasts seeking enhanced clutch performance and durability.

• Brand: Clutch Masters
• Product: FX300 Single Disc Clutch Kit 18-21 WRX
• Part Number: 15915-HDTZ
• Fitment: 2004-2005 Baja / 2004-2005 Forester / 2002-2005 WRX / 1991-1994 Legacy
• Material: Billet Aluminum Cover, Steel Backed Segmented Kevlar Disc
• Finish: Natural billet aluminum and steel
• Construction: CNC Machined Billet Cover, Segmented Kevlar Friction Material
• Origin: Not specified
• Power Gains: Supports up to medium-boost turbo / supercharger / ~100hp NO2
• Tuning Required: Recommended for optimal performance
• Clutch Type: Single Disc, Street Performance
• Pedal Effort: Slightly increased over stock
• Release Bearing: Included, designed for short throw
• Break-in Period: Minimum 500 miles required

Key Benefits

• Performance: 110% increased holding capacity for enhanced torque management on tuned WRX platforms
• Durability: Steel-backed segmented Kevlar disc offers long life with non-abrasive friction material
• Pedal Feel: Slightly heavier pedal pressure for positive engagement without fatigue
• Fitment: Compatible with stock single disc flywheels and factory hydraulic systems
• Shift Quality: Shorter, faster, and more precise shifts thanks to lightweight billet aluminum cover
• Street Friendly: Designed for daily driving with smooth engagement and consistent pedal feel

What's Included

• 1× Clutch Masters FX300 Single Disc Clutch Kit
• 1× Heavy-Duty Billet Aluminum Clutch Cover
• 1× Steel Backed Segmented Kevlar Disc
• 1× New Throw Out Bearing (short throw design)
• 1× Pilot Bearing (if applicable)
• 1× Alignment Tool
• 1× Instruction Card
• Decals

Installation & Compatibility

Installation of the Clutch Masters FX300 Single Disc Clutch Kit is moderately complex and generally recommended for experienced DIYers or professional mechanics. It fits directly onto stock single disc flywheels or compatible aftermarket flywheels designed for OE-style clutch kits. No major modifications are required, but proper break-in procedures are essential to ensure clutch longevity and optimal performance. While the clutch works with factory hydraulic systems, upgrading to Clutch Masters’ internal hydraulic release bearing and master cylinder is recommended for best results. Tuning your engine management may be necessary to accommodate the increased torque capacity and maintain drivability.

• Professional Installation: Recommended
• Modifications Required: None
• Verify Compatibility: Confirm fitment for your specific year and trim level

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