2001-2006 BMW M3 XACT Prolite Flywheel by ACT Dramatically improved engine response and acceleration, mild to moderate gear rattle; Heat-treated forging for strength and toughness, induction-hardened ring gears for maximum life; One piece construction allows less opportunity for failure and provides uniform efficient heat transfer from the clutch disc. No more warped inserts or loose ring gears; Recommended for race use; Forged, CNC machined and dynamically computer balanced for smooth high RPM reliability Features Product Weight (lbs.): 9.9 Material: Chromoly Steel Flywheel Type: Prolite Tooth Quantity: 113 SFI: 1.1 Benefits Dramatically improved engine response and acceleration, mild to moderate gear rattle Heat-treated forging for strength and toughness, induction-hardened ring gears for maximum life One piece construction allows less opportunity for failure and provides uniform efficient heat transfer from the clutch disc. No more warped inserts or loose ring gears Forged, CNC machined and dynamically computer balanced for smooth high RPM reliability Applications 2001-2006 BMW M3 What\’s In The Box? 1 – ACT XACT Prolite Flywheel Warranty ACT 1-Year Limited Warranty