Clutch Masters 725 Series Street Twin Disk Clutch Kit for 2004-2021 WRX STI
Even with basic bolt on mods the EJ25 motor in your WRX STI will produce close to 300HP. At this power level the stock clutch becomes incapable of supporting the upgrades and more aggressive driving from track days. The 725 twin disk clutch is rated for around 850 horsepower and is a must have to put the power to the ground for any track ready WRX STI while also shaving rotating mass from your engine!
This 725 series street kit is a 7.25″ (184mm) twin disc clutch with a custom cover plate that is machined from billet aluminum and is then Type 3 hard anodized. By machining the strongest cover possible while maintaining minimal weight, Clutch Masters was basically able to eliminate any flex in the cover. The billet covers see only .003″ of flex where as a cast or stamped unit can see as much as .030″ of flex. By eliminating this flex in the cover, the driver is able to operate the clutch much more consistently and confidently. The strength of the covers also results in greater clamping force over the same amount of area vs a cast or stamped cover. This means the twin discs are easy to drive and have superior clamping force to make sure all the power your engine is making is being utilized.
What makes the 725 kits truly special, and a feature unique to Clutch Masters is the QR System, or Quick Release Pressure Plate. The QR System Incorporates three spring-loaded bolts allowing the pressure plate to engage and disengage evenly and smoothly while reducing internal clutch noise/chatter by up to 50%. The QR System was developed to provide quiet and smooth operation for the user while delivering the performance a race clutch needs.
**The 15017-TD7R-SHV and this kit are very similar, the only difference is this kit has 1 organic disc and 1 ceramic disc (not 2 ceramic discs) which makes for easier for engagement.**
- Hard Anodized Aluminum Cover Assembly with attached Diaphragm
- Titanium reinforcement bushings for the Quick Release Pressure Plate system.
- Pressure Plate Ring
- Quick Release Pressure Plate System
- One Ceramic Rigid Disc
- One Organic Rigid Disc
- One Floating Mid Plate
- Lightweight Steel Flywheel
- Push-type Conversion Kit with Release Bearing
- Pilot Bearing
- Pressure Plate Bolts
Flywheels are made for each specific application in steel and meet SFI spec 1.2 for competition in NHRA, NDRA, IDRC, IHRA, SCCA and NASA.
This kit is specifically designed for the serious drag racing with very significant modifications to their WRX STI, and most importantly one of our infamous Brewed tunes.