{"product_id":"act-hd-perf-street-sprung-clutch-kit-monoloc-2004-2021-subaru-wrx-sti-sb10-hdss","title":"ACT Heavy Duty Performance Street Sprung Clutch Kit with Monoloc, 2004-2021 Subaru WRX STI | SB10-HDSS","description":"\u003cp\u003eThe ACT SB10-HDSS pairs ACT's Heavy Duty pressure plate with its Performance Street sprung disc and ACT's patented Monoloc for the Subaru WRX STI and Legacy GT spec.B. The Heavy Duty pressure plate uses ACT's exclusive diaphragm design to increase clamp load and reduce deflection, with every diaphragm going through a four-stage heat-treating process. The Performance Street disc uses premium organic friction material with high copper content for improved heat transfer and steel-backed lining for durability, with reduced marcel for faster shifts. Monoloc is a one-piece, direct replacement for the standard two-piece wedge collar and wire ring used in pull-type clutches; its hardened chrome-moly construction provides uniform loading on the bearing and pressure plate regardless of driver influence or vehicle modifications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTorque Capacity: 522 ft-lb (45% over OE)\u003c\/li\u003e\n\u003cli\u003eProduct Weight: 18.2 lbs\u003c\/li\u003e\n\u003cli\u003eDisc Diameter: 9.4 in (240 mm)\u003c\/li\u003e\n\u003cli\u003ePressure Plate: Heavy Duty, four-stage heat-treated diaphragm\u003c\/li\u003e\n\u003cli\u003eDisc Material: Organic, high-copper content, steel-backed lining\u003c\/li\u003e\n\u003cli\u003eDisc Style: Sprung hub\u003c\/li\u003e\n\u003cli\u003eIncludes: ACT Monoloc, chrome-moly construction\u003c\/li\u003e\n\u003cli\u003ePedal Feel: Light to moderate effort, smooth positive engagement, OE to mild gear rattle, confidence during hard shifts\u003c\/li\u003e\n\u003cli\u003eRecommended Use: Street and race use\u003c\/li\u003e\n\u003cli\u003ePart Number: SB10-HDSS\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eVehicle Applications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2004 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2005 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2006 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2007 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2008 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2009 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2010 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2011 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2012 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2013 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2014 Subaru Impreza WRX STI\u003c\/li\u003e\n\u003cli\u003e2010 Subaru Impreza WRX STI Special Edition\u003c\/li\u003e\n\u003cli\u003e2007 Subaru Legacy GT spec.B\u003c\/li\u003e\n\u003cli\u003e2008 Subaru Legacy GT spec.B\u003c\/li\u003e\n\u003cli\u003e2009 Subaru Legacy GT spec.B\u003c\/li\u003e\n\u003cli\u003e2013 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2014 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2015 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2016 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2017 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2018 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2019 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2020 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2021 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e2015 Subaru WRX STI Launch Edition\u003c\/li\u003e\n\u003cli\u003e2015 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2016 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2017 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2018 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2019 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2020 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2021 Subaru WRX STI Limited\u003c\/li\u003e\n\u003cli\u003e2016 Subaru WRX STI Series.HyperBlue\u003c\/li\u003e\n\u003cli\u003e2017 Subaru WRX STI Sport\u003c\/li\u003e\n\u003cli\u003e2018 Subaru WRX STI Sport\u003c\/li\u003e\n\u003cli\u003e2019 Subaru WRX STI Sport\u003c\/li\u003e\n\u003cli\u003e2020 Subaru WRX STI Sport\u003c\/li\u003e\n\u003cli\u003e2021 Subaru WRX STI Sport\u003c\/li\u003e\n\u003cli\u003e2014 Subaru WRX STI Tsurugi Edition\u003c\/li\u003e\n\u003cli\u003e2018 Subaru WRX STI Type RA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWarning: This product can expose you to chemicals including carbon black, glass wool fibers, or silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat torque capacity does the SB10-HDSS handle?\u003c\/h5\u003e\u003cp\u003eThe kit is rated for 522 ft-lb of torque capacity, a 45% increase over the factory clutch.\u003c\/p\u003e\u003ch5\u003eWhat is Monoloc and why is it included?\u003c\/h5\u003e\u003cp\u003eMonoloc is ACT's patented one-piece replacement for the standard two-piece wedge collar and wire ring in pull-type clutches. Its chrome-moly construction provides uniform, consistent loading on the bearing and pressure plate for longer release mechanism life.\u003c\/p\u003e\u003ch5\u003eWhat vehicles does the SB10-HDSS cover?\u003c\/h5\u003e\u003cp\u003eIt covers the Subaru Impreza WRX STI and WRX STI (2004-2021) plus the Legacy GT spec.B (2007-2009). See the Vehicle Applications list above to confirm the exact year and trim.\u003c\/p\u003e\u003ch5\u003eIs this kit suitable for daily driving?\u003c\/h5\u003e\u003cp\u003eYes. It is engineered for light to moderate pedal effort with smooth, positive engagement and only OE to mild gear rattle, and is recommended for both street and race use.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What torque capacity does the SB10-HDSS handle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The kit is rated for 522 ft-lb of torque capacity, a 45% increase over the factory clutch.\"}},{\"@type\":\"Question\",\"name\":\"What is Monoloc and why is it included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Monoloc is ACT's patented one-piece replacement for the standard two-piece wedge collar and wire ring in pull-type clutches. Its chrome-moly construction provides uniform, consistent loading on the bearing and pressure plate for longer release mechanism life.\"}},{\"@type\":\"Question\",\"name\":\"What vehicles does the SB10-HDSS cover?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It covers the Subaru Impreza WRX STI and WRX STI (2004-2021) plus the Legacy GT spec.B (2007-2009).\"}},{\"@type\":\"Question\",\"name\":\"Is this kit suitable for daily driving?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It is engineered for light to moderate pedal effort with smooth, positive engagement and only OE to mild gear rattle, and is recommended for both street and race use.\"}}]}\u003c\/script\u003e","brand":"Advanced Clutch","offers":[{"title":"Default Title","offer_id":42652789735472,"sku":"BHXS_SB10-HDSS","price":833.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/ACTSB10-HDSS.jpg?v=1765876237","url":"https:\/\/berryperformancesales.com\/products\/act-hd-perf-street-sprung-clutch-kit-monoloc-2004-2021-subaru-wrx-sti-sb10-hdss","provider":"Berry Performance Sales","version":"1.0","type":"link"}