Ultra Series aluminum flywheels have some key advantages over stock and other aftermarket units. Because of their light weight, energy normally used to turn the heavy stock steel flywheel is now used to turn your drive wheels! In addition, the reduced mass allows the engine to rev faster and get you into your power band more quickly. For turbo cars this is an even greater advantage, allowing the turbos to kick in faster since the engine is revving more quickly! Acceleration On Demand Our flywheels are the perfect choice for street use, drag racing, autocross, and road race events. Benefits: Lightweight 6061-T6 billet aluminum, 10lbs flywheels, CNC machined to .001", real HP & torque gains across entire RPM range, wear-resistant, replaceable treated alloy steel friction inserts, Stepped Dowel Pins, torque plates included in applications where required, works with both stock or aftermarket clutches, high quality polished finish Shipping: This item is shipped directly from the the manufacturer 5-14 days to ship to your location.