XClutch Lightweight Chromoly Flywheel - 2013-2021 Subaru WRX STi / Type RA 2.5L

Maximize your WRX STi's performance with the XClutch lightweight chromoly flywheel. Engineered from high-strength chromoly steel with an ultra-lightweight design, this flywheel delivers exceptional throttle response, lightning-fast revving, and track-ready performance. Designed specifically for the 2013-2021 Subaru WRX STi and Type RA models.

Key Features:

• Ultra-lightweight chromoly steel construction for maximum performance
• Significantly lighter than standard chromoly flywheels for aggressive builds
• Integral ring gear included - ready to install
• Timing sensor ring included
• Precision-machined friction surface for optimal clutch engagement
• Designed specifically for motorsport and track applications
• Compatible with stock and aftermarket clutches
• XClutch quality engineering with 30+ years of experience

Performance Benefits:

• Maximum Throttle Response: Ultra-light design allows engine to rev instantly
• Lightning-Fast Acceleration: Minimal rotational mass for quickest possible acceleration
• Razor-Sharp Shifting: Extremely light flywheel makes rev-matching effortless
• Track-Ready Performance: Ideal for time attack, autocross, and road racing
• High-Strength Construction: Chromoly steel withstands extreme motorsport use
• Maximum Weight Reduction: Lightest flywheel option for serious builds

Specifications:

• Brand: XClutch
• Part Number: XFSU003CL
• Material: Chromoly steel (lightweight design)
• Ring Gear: Integral (included)
• Timing Sensor Ring: Included
• Weight: 14.9 lbs (ultra-lightweight)
• Barcode: XFSU003CL

Fitment Information:

• Compatible Vehicles:
• 2013-2014 Subaru WRX STi (EJ257)
• 2015-2021 Subaru WRX STi (EJ257)
• 2018-2021 Subaru WRX STi Type RA (EJ257)
• Note: Designed specifically for 2013+ WRX STi with 2.5L EJ257 engine

What's Included:

• XClutch lightweight chromoly flywheel
• Integral ring gear (pre-installed)
• Timing sensor ring
• Installation instructions

Installation Notes:

• Professional installation strongly recommended
• Transmission removal required for installation
• Installation time: approximately 6-8 hours
• Flywheel surface is pre-machined and ready to install
• Use new flywheel bolts (not included - use OEM or ARP)
• Torque flywheel bolts to Subaru specifications
• Compatible with stock and aftermarket clutches
• Break-in period: 500 miles of moderate driving recommended

Lightweight vs. Standard Chromoly:

This is XClutch's ultra-lightweight version of their chromoly flywheel, designed for maximum performance in motorsport applications. Compared to their standard chromoly flywheel (XFSU003C at 18.7 lbs), this lightweight version weighs only 14.9 lbs - a reduction of nearly 4 pounds of rotational mass. This aggressive weight reduction delivers even sharper throttle response and faster revving, making it ideal for track-focused builds where ultimate performance is the priority.

Why Ultra-Lightweight Design?

Reducing rotational mass in the drivetrain has exponential performance benefits. Every pound removed from the flywheel allows the engine to accelerate and decelerate more quickly, improving throttle response, acceleration, and shift speed. The ultra-lightweight design is especially beneficial for motorsport applications where rapid throttle transitions and precise rev-matching are critical for lap times.

Why Chromoly Steel?

Chromoly (chromium-molybdenum) steel is an alloy known for its exceptional strength-to-weight ratio. It's significantly stronger than standard steel, allowing XClutch to achieve ultra-lightweight construction while maintaining the structural integrity needed for high-RPM motorsport use. Chromoly is the material of choice for professional racing teams who demand maximum performance and reliability.

Why XClutch?

XClutch is an Australian engineering company with over 30 years of clutch and flywheel development experience. Their lightweight chromoly flywheels are designed using advanced materials and manufacturing processes to deliver exceptional performance and durability. XClutch flywheels are trusted by top motorsport teams and tuners worldwide for competition use.

Motorsport-Focused Design:

This ultra-lightweight flywheel is designed specifically for motorsport and track applications. While it can be used on the street, the aggressive weight reduction will result in more noticeable idle vibration and may make low-speed driving slightly less smooth compared to heavier flywheels. However, for track-focused builds where performance is the priority, the benefits far outweigh any minor drivability compromises.

Clutch Compatibility:

The XClutch lightweight chromoly flywheel is compatible with both stock and aftermarket clutches. However, for maximum performance and reliability in motorsport applications, pairing this flywheel with a high-performance clutch kit is strongly recommended. The precision-machined friction surface ensures optimal clutch engagement and longevity.

Perfect For: Track-focused WRX STi builds, time attack competitors, autocross racers, rally drivers, or serious enthusiasts who prioritize maximum performance and throttle response over street comfort.

Pro Tip: The ultra-lightweight design delivers maximum performance but may cause more idle vibration than heavier flywheels. This is normal for lightweight flywheels and does not affect performance or reliability.

Comparison: This lightweight version (14.9 lbs) is approximately 4 lbs lighter than XClutch's standard chromoly flywheel (18.7 lbs), making it the ultimate choice for track-focused builds.

Upgrade your Subaru WRX STi with XClutch's ultra-lightweight chromoly flywheel - engineered for maximum performance, built for motorsport.