XClutch 15 21 Subaru WRX STi Base 2.5L 9in Twin Sprung Ceramic Clutch Kit XClutch Twin Solid Organic Clutch Kit 2002 2021 Subaru WRX STI, 2004 Xtreme Performance Solid Ceramic Clutch Kit Subaru STI 01 05 (EJ20 6MT XClutch Carbon Blade Stage 3 Clutch Kit Rallysport Direct XClutch Twin Disc Clutch Kit Subaru WRX (04 05) WRX STi (04 21) Organi. XClutch performance upgrades have been engineered to provide the ultimate in clutch performance. Utilizing the latest pressure plate design and friction material composition, XClutch upgrades offer the ideal balance between driveability and performance for different vehicle applications. The pivot point and diaphragm design are carefully analyzed to ensure positive pedal feel and increased clamping force. With one of the world's most advanced clutch testing and R&D facilities, in house vehicle testing and over 30 years of clutch experience, XClutch performance upgrades offer the highest levels of engineering and product development for your street vehicle, 4x4 or dedicated race car. Primarily designed for road going vehicles, XClutch Stage 1 clutch kits deliver substantial increases in performance and torque holding capabilities whilst retaining ease of driveability. The 1T range of clutch kits offer organic friction material bonded directly to a steel backing disc, improving their overall burst strength in performance vehicles. This range is ideal for performance vehicles that require driveability on the street and are often used for higher rpm launches where the clutch will be put to the ultimate test.