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 ST lightweight flywheels are designed for street/strip driven applications and are well suited for Stage 1 and Stage 2 clutch kit counterparts. The STU ultra lightweight flywheel is even lighter, designed for extremely fast gear changes and recommended for Stage 3 and up clutch upgrades only. 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 ST flywheel is compatible with ALL performance and stock clutch assemblies for ultimate versatility.