Comp Clutch 2-721-ST Lightweight Steel Flywheel for 2004-2021 Subaru WRX STI

Vehicle Fitment

• 2004-2014 Subaru Impreza WRX STI (Base, Limited, Special Edition, 2.5L Turbo, Manual)
• 2015-2021 Subaru WRX STI (Base, Limited, Launch Edition, Series.HyperBlue, 2.5L Turbo, Manual)

Features

• Lightweight steel flywheel engineered for street performance
• Preserves low-end torque and everyday drivability
• 15 lb design reduces rotating mass for quicker throttle response
• 4140 forged steel one-piece construction for strength and durability
• CNC machined and dynamically balanced for smooth operation
• Works with stock, Stage 1, and Stage 2 clutch kits
• SFI certified for performance and safety standards
• Recommended for naturally aspirated and street-driven applications

Specifications

• Brand: Comp Clutch (Competition Clutch)
• Part Number: 2-721-ST
• Flywheel Type: Lightweight steel
• Material: 4140 forged steel
• Approx. Weight: 15 lbs
• Transmission: Manual
• SFI Certified: Yes
• Compatible with multiple clutch disc configurations

Included Components

• 1x Lightweight steel flywheel (2-721-ST)
• 1x Alignment tool (if applicable)

Product Description

The Comp Clutch 2-721-ST Lightweight Steel Flywheel is a performance-oriented upgrade for Subaru WRX STI vehicles from 2004 through 2021 with a 2.5 L turbocharged engine and manual transmission. Designed to reduce rotating mass compared to the heavier OEM flywheel, this 15 lb forged steel unit enhances throttle response, allowing the engine to rev more quickly and improving overall acceleration feel while maintaining usable low-end torque for daily driving.

Constructed from durable 4140 forged steel and dynamically balanced for precision, the 2-721-ST flywheel integrates with a wide range of clutch setups, from OEM replacements to Stage 1 and Stage 2 performance kits. Its lightweight design is ideal for enthusiasts seeking sharper engine response and a more engaging driving experience on street or light performance builds. The included alignment tool (if applicable) helps streamline installation.