{"product_id":"clutch-masters-850-pro-series-twin-disc-clutch-kits-and-flywheel-2006-2009-legacy-2004-2021-sti","title":"Clutch Masters 850 PRO Series Twin Disc Clutch Kit \u0026 Flywheel 06-09 Legacy \/ 04-21 STI","description":"\u003ch3\u003eClutch Masters 850 PRO Series Twin Disc Clutch Kit \u0026amp; Flywheel 06-09 Legacy \/ 04-21 STI | 8.5\" Twin Disc | High-Torque Clutch Kit\u003c\/h3\u003e\n\n\u003ch4\u003eOverview\u003c\/h4\u003e\n\u003cp\u003eThe Clutch Masters 850 PRO Series Twin Disc Clutch Kit \u0026amp; Flywheel is a high-performance conversion kit designed specifically for the 2006-2009 Subaru Legacy and 2004-2021 Subaru WRX STI. This kit replaces the OEM flywheel and clutch setup with a purpose-built system engineered to handle extreme torque and aggressive driving conditions. Ideal for enthusiasts pushing their Subaru’s power limits, this clutch kit offers a significant upgrade in strength, durability, and engagement precision.\u003c\/p\u003e\n\u003cp\u003eBuilt as the next evolution of Clutch Masters’ multi-disc clutch technology, the 850 PRO Series features a completely redesigned 8.5-inch clutch system. It incorporates advanced materials and engineering solutions such as 12 heat-treated 4140 steel stands and a 12-point nut and stud mounting system, replacing the traditional 6-post aluminum design. This approach eliminates flex and wear issues common in high horsepower applications, ensuring reliable performance on both street and track.\u003c\/p\u003e\n\u003cp\u003eSubaru owners will appreciate the real-world benefits of this clutch kit’s design, including a next-generation driven hub that reduces spline wear and improves transmission input shaft alignment. The kit’s ceramic friction discs provide consistent engagement and heat resistance, making it suitable for serious street performance and competitive motorsports. With options for billet aluminum or steel flywheels, this kit offers flexibility to match your build’s strength and weight requirements.\u003c\/p\u003e\n\n\u003ch4\u003eFeatures \u0026amp; Specifications\u003c\/h4\u003e\n\u003cp\u003eThis Clutch Masters 850 PRO Series Twin Disc Clutch Kit \u0026amp; Flywheel is engineered for Subaru Legacy and WRX STI platforms and features an 8.5-inch twin ceramic disc setup. Constructed from heat-treated 4140 steel and billet aluminum or steel flywheels, it delivers exceptional torque capacity and durability for Subaru enthusiasts seeking aggressive street and track performance.\u003c\/p\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Clutch Masters\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e 850 PRO Series Twin Disc Clutch Kit \u0026amp; Flywheel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 15017PTD80SHV\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e 2006-2009 Legacy \/ 2004-2021 STI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 4140 Heat-Treated Steel (clutch), 6061-T6 Billet Aluminum or 1045 Billet Steel (flywheel)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Type 3 Hard Coat Anodized (aluminum flywheel), Black Oxide (steel flywheel)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e 12-Point Nut and Stud Mounting, Precision Machined\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTorque Capacity:\u003c\/strong\u003e 800 ft.lbs (estimated)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClutch Disc Configuration:\u003c\/strong\u003e Twin Disc Ceramic Friction\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Stages:\u003c\/strong\u003e Sprung Race (PTD80), Rigid Race (PTD8R)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlywheel Options:\u003c\/strong\u003e Billet Aluminum or Billet Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eServiceability:\u003c\/strong\u003e Fully Serviceable with Rebuild Kits Available\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eKey Benefits\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePerformance:\u003c\/strong\u003e Handles up to 800 ft.lbs of torque, ideal for high horsepower builds and aggressive driving.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Heat-treated 4140 steel construction resists flex and wear under extreme conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Designed exclusively for Subaru Legacy (06-09) and WRX STI (04-21) with a dedicated flywheel for perfect compatibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngagement:\u003c\/strong\u003e Ceramic friction discs provide consistent, smooth engagement with reduced spline wear thanks to the next-gen driven hub.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustability:\u003c\/strong\u003e Choice between sprung and rigid race disc configurations to match driving style and vehicle setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality:\u003c\/strong\u003e Proudly manufactured in the USA with rigorous quality control and race team input.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Clutch Masters 850 PRO Series Twin Disc Clutch Kit\u003c\/li\u003e\n  \u003cli\u003e1× Clutch Masters Billet Aluminum or Steel Flywheel (application-specific)\u003c\/li\u003e\n  \u003cli\u003eMounting hardware for clutch and flywheel installation\u003c\/li\u003e\n  \u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp\u003eInstallation of the Clutch Masters 850 PRO Series Twin Disc Clutch Kit \u0026amp; Flywheel is a moderate to advanced mechanical task best suited for experienced DIYers or professional shops. The kit requires removal of the transmission and replacement of the OEM flywheel, which is not compatible with this clutch system. No special tools beyond standard clutch alignment and transmission tools are required, but care must be taken to ensure proper torque specs and alignment during installation. Tuning is recommended after installation to optimize clutch engagement and drivability, especially on modified vehicles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProfessional Installation:\u003c\/strong\u003e Recommended\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModifications Required:\u003c\/strong\u003e OEM flywheel must be replaced; clutch master flywheel required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVerify Compatibility:\u003c\/strong\u003e Confirm fitment for your specific year and trim level of Legacy or WRX STI\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShop with confidence at Subimods—your Subaru parts specialists.\u003c\/p\u003e","brand":"Clutch Masters","offers":[{"title":"Default Title","offer_id":47131501133999,"sku":"15017PTD80SHV","price":2380.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/3598\/4815\/files\/M198794417.jpg?v=1782934939","url":"https:\/\/subimods.com\/products\/clutch-masters-850-pro-series-twin-disc-clutch-kits-and-flywheel-2006-2009-legacy-2004-2021-sti","provider":"Subimods.com","version":"1.0","type":"link"}