Perf Street Sprung Disc by ACT 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 Features Product Weight (lbs.): 3.4 SFI: 1.1 Diameter: 9.4 Diameter: 240 Spline Quantity: 22 Disc Material: Organic Splined Bore Diameter: 1.125 Benefits 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 Steel-backed linings for higher burst strength, reduced marcel for quicker shifts Applications 2004-2006 BMW 330i 2006-2007 BMW 525xi 2006-2011 BMW Z4 2004-2006 BMW 330xi 2004-2006 BMW 330Ci What\’s In The Box? 1 – ACT Perf Street Sprung Disc Warranty ACT 1-Year Limited Warranty