Installation of a lightweight flywheel on your engine will reduce rotational mass on the crankshaft, producing faster revs, less drive train loss, quicker acceleration and more power to the wheels. The Competition Clutch STU lightweight flywheel is designed for race driven applications and is well suited for Stage 3 and up clutch kit counterparts. All Competition Clutch lightweight flywheels are CNC machined and balanced to OE specifications exceed SFI 1.5 quality assurance specifications. Unlike many other brands, the Competition Clutch STU flywheel is compatible with ALL performance and stock clutch assemblies for ultimate versatility.