XACT Streetlite Flywheel by ACT Noticeably improved engine response and acceleration, OE to mild 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 street and race use; Forged, CNC machined and dynamically computer balanced for smooth high RPM reliability Features Product Weight (lbs.): 17.9 Material: Chromoly Steel Flywheel Type: Streetlite Tooth Quantity: 115 SFI: 1.1 Benefits Noticeably improved engine response and acceleration, OE to mild gear rattle Heat-treated forging for strength and toughness, induction-hardened ring gears for maximum life Forged, CNC machined and dynamically computer balanced for smooth high RPM reliability 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 Applications 2009-2014 BMW 535i 2009-2016 BMW Z4 2014-2016 BMW 435i 2009-2013 BMW 135i 2009-2015 BMW 335i What\’s In The Box? 1 – ACT XACT Streetlite Flywheel Warranty ACT 1-Year Limited Warranty