ACT 600355 XACT Streetlite Flywheel Improved engine response and acceleration with lightweight design ACT heat treats the entire forging for strength and toughness and induction hardens the ring gears for longest gear 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 All flywheels are CNC machined and dynamically computer balanced for super smooth high RPM reliability