ACT Sprung HD Street Clutch Kit 3000503 is a performance street disc and the most popular disc purchased. It features premium organic materials with high copper content for better heat transfer. Performance street discs allow for quicker shifting and smooth engagement. These discs feature a reduced marcel for faster shift action to complement ACT pressure plates. ACT spring-centered assemblies use bushings and cone springs similar to factory clutch discs. This creates frictional dampening, which improves clutch life and reduces noise. Quiet operation with increased strength and reliability. Features Smooth engagement, quicker shifts, OE to mild gear rattle Premium organic composite friction blended for high heat tolerance, increased burst strength, faster recovery from overheating and less wear of mating surfaces Spring retainers feature heat-treated wraparound spring windows that provide support and reduce stress concentrations that are common causes for failure Recommended for street and race use Steel-backed linings for higher burst strength, reduced marcel for quicker shifts Applications 2004-2021 Subaru WRX STI 2007 Subaru Legacy GT spec.B 2.5L *6 speed applications only – Must use ACT or factory flywheel for the 2004 and newer WRX STi What\’s in the box? 3000503 – Perf Street Sprung Disc