6-Pad Spring-Centered Ceramic Race Clutch Kit

The ACT Xtreme Duty 6-Puck Disc Clutch Kit, model SB10-XTG6, is engineered by Advanced Clutch Technology for high-performance driving that blends street and track use. This kit features an ACT Xtreme pressure plate, which utilizes an exclusive diaphragm design to achieve maximum clamp load for the highest single-disc holding capacity available. Complementing the pressure plate is a 6-pad spring-centered ceramic race clutch disc, designed for engagement that is more aggressive than a typical street disc but more compliant than a rigid disc. Constructed with durability in mind, the ACT Xtreme pressure plate boasts precision cover stampings and a four-stage heat-treated diaphragm. The clutch disc features chrome-moly hubs that are heat-treated for strength and longevity, even under repeated high-heat cycling typical of performance driving. The sprung hub construction with ACT's wraparound spring window design and thicker retainer stampings enhances durability during hard engagements. This clutch kit is application-specific, meaning ACT designs each component—disc diameter, pressure plate sizing, and disc specification—to precisely match the intended vehicle. This ensures correct geometry and spring rates, rather than relying on adapted universal designs. The kit includes the ACT pressure plate, ACT clutch disc, hardware, and an alignment tool, along with installation instructions. The ceramic pads provide the necessary heat capacity for sustained hard driving, while the sprung center hub helps dampen torsional shocks, reducing direct transmission to the drivetrain. This makes it a suitable choice for builds that see both spirited street driving and rigorous track sessions. The kit is application-specific to 2004-2021 Subaru WRX STI models with the EJ257 engine, and 2007-2009 Subaru Legacy GT spec.B models.