ACT XACT Prolite Flywheel 600170 is a Prolite flywheel, which is ACT\’s lighter flywheel offering with lowest inertia. Prolite flywheels are designed for best throttle response and acceleration. Prolite flywheels are preferred for road racing or rally racing, and have reduced drivability. Materials are properly distributed for maximum strength, good heat tolerance and rigidity. ACT flywheels are serviceable and can be resurfaced with no need to purchase additional parts. Features 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 Benefits Designed for best throttle response and acceleration Materials are properly distributed for maximum strength Good heat tolerance and rigidity Applications 2002-2005 Subaru WRX 2004-2005 Subaru Baja Turbo 2004-2005 Subaru Forester XT / XT Premium 1991-1994 Subaru Legacy Sport What\’s in the box? 600170 – XACT Flywheel Prolite PB1004 – Pilot Bearing Installation Instructions!