SKU: P2-721-ST | UPC: 887753963079
Competition Clutch 2004-2011 Subaru STI 15lb Steel Flywheel
Competition Clutch Lightweight Steel Flywheel 2-721-ST delivers reduced rotational mass for quicker revs on 2004-2021 Subaru Impreza WRX STI and WRX STI models. This 15lb ST series unit maintains low-end torque and smooth driveability ideal for naturally aspirated street use. Pair it with Gravity Stage 1 or Stage 2 clutches for reliable daily performance.
Key Features
- 15lb Weight: Lightens engine response without sacrificing street manners or low rpm torque like aluminum options
- 4140 Forged Steel: Provides heat resistance and long-term durability for consistent performance
- One-Piece Design: Ensures perfect balance and straightforward bolt-on installation
- SFI 1.2 Certified: Meets track safety standards for worry-free operation
- Street/NA Focus: Works with OEM or upgraded clutches on modified Subarus
Product Notes
- Designed for use with Competition Clutch Gravity Stage 1 or Stage 2 kits
- Inspect ring gear teeth during clutch service for optimal engagement
- Heavy item requires secure packaging for transit
Installation Notes
- Professional installation recommended.
- Use Subaru flywheel locking tool and torque to spec during install
- Compatible with OEM flywheel bolts no additional hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2014 | Subaru | Impreza | WRX STI |
| 2007 | Subaru | Impreza | WRX STI Limited |
| 2011-2014 | Subaru | Impreza | WRX STI Limited |
| 2010 | Subaru | Impreza | WRX STI Special Edition |
| 2015-2016 | Subaru | WRX STI | Base |
| 2015 | Subaru | WRX STI | Launch Edition |
| 2016 | Subaru | WRX STI | Series.HyperBlue |
Why Choose Competition Clutch?
- Proven in rally and track applications worldwide
- Engineered for Subaru EJ and FA engines
- Backed by dyno testing and real-world validation
Frequently Asked Questions
-
Q: Does this flywheel fit 2015-2016 Subaru WRX STI models?
A: Yes fits 2015-2016 WRX STI Base Launch Edition and Series.HyperBlue with 6-speed transmission -
Q: What material and ring gear details?
A: 4140 forged steel one-piece with 12-tooth Subaru ring gear pressed on for direct OEM clutch compatibility -
Q: What warranty coverage?
A: Limited warranty against manufacturing defects contact Competition Clutch for claim process
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Foam protected box 14 x 14 x 6 inches
- Weight: 15 lbs
Competition Clutch
Competition Clutch kits for Honda K, B, and D-series, Subaru WRX and STI EJ, Nissan 350Z, 370Z, 240SX, and 400Z, Mitsubishi EVO and DSM, Mazda Miata and RX-7, and sport compact applications are stocked at Black Ops Auto Works. Shop Stage 1 to Stage 5 clutch kits, twin disc clutches, lightweight flywheels, clutch discs, pressure plates, release bearings, and sport compact drivetrain parts for proven street, drag, road course, and high horsepower engine builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 197 Competition Clutch SKUs across the fitments and build levels enthusiasts actually use. What Competition Clutch Covers Competition Clutch offers staged clutch kits, twin and triple disc systems, lightweight flywheels, discs, pressure plates, release bearings, forks, and service components for sport compact, import, and selected domestic performance cars. Stage selection exp...
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Drivetrain
Drivetrain parts for high-horsepower Mopar, truck, Jeep, and import platforms are stocked at Black Ops Auto Works. Shop differentials, axles, driveshafts, clutch kits, flywheels, flexplates, shifters, transmission components, ring and pinion gears, differential braces, and driveline hardware for Hellcat, Trackhawk, TRX, HEMI, LS, LT, Coyote, and turbocharged import platforms. Every drivetrain part is filterable by vehicle platform, drivetrain layout, transmission type, and power level so the correct part ships the first time. Black Ops Auto Works carries 4,765 drivetrain SKUs across differentials, axles, clutches, and transmission hardware. What This Category Covers The drivetrain transfers power from the engine to the wheels and includes the transmission, clutch, driveshafts, axles, differentials, ring and pinion gears, wheel hubs, wheel bearings, U-joints, shifters, mounts, and bushings. Upgrading these components improves power delivery, durability, and reliability under incr...
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Flywheels
Performance flywheels for manual transmission builds are stocked at Black Ops Auto Works. Shop billet steel flywheels, chromoly flywheels, dual-mass replacement flywheels, and lightweight aluminum flywheels for HEMI, Viper, LS, Coyote, K-series, EJ, 2JZ, and RB platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 414 flywheel SKUs across weight, material, and tooth count categories. What This Category Covers The Flywheels collection spans lightweight aluminum flywheels for quick-revving race builds, billet steel flywheels for street and strip durability, and dual-mass replacement flywheels for daily-driven applications that need factory-level smoothness. The catalog is strongest on ACT, South Bend Clutch, and Fidanza flywheels for domestic muscle cars and import platforms, alongside OE-style dual-mass replacements for diesel trucks and European cars. Categories Included St...
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Transmissions
Transmission and drivetrain hardware for manual and automatic platforms are stocked at Black Ops Auto Works. Shop flywheels, flexplates, transmission crossmembers, mounts, coolers, valve bodies, shifters, shifter bushings, release bearings, slave cylinders, U-joints, and transmission rebuild kits for Subaru WRX and STI, Dodge Cummins diesel, GM G-Body and F-Body, BMW B58 and S58, Nissan 350Z, and Toyota GR Corolla platforms. Every part is filterable by year, make, model, and transmission type so builders can confirm the correct fitment before ordering. Black Ops Auto Works carries 1,322 transmission and drivetrain SKUs. What This Category Covers This collection spans the hardware that connects the engine to the drivetrain and manages gear selection, including flywheels, flexplates, transmission crossmembers, bell housings, transmission mounts, pans, coolers, filters, valve bodies, transmission internals, shifters, shifter bushings and cables, release bearings, slave cylinders, U...
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