Dibs was able to tell that the Spec clutch was balanced by the machining on the back of the flywheel (arrows). We like heavy flywheels because the extra inertia makes wheeling in rocks easier, so we were alarmed that the new flywheel was lighter than the factory one. The Spec flywheel is 23.5 pounds and the factory flywheel 27.5 pounds. Then we realized that the Spec clutch disc and pressure plate weighs 22.5 pounds and the stock only 18.5 pounds. That means the overall package is the same weight as the factory setup was, just with more beef in the pressure plate assembly.