Aluminum flywheels have been used for many years for increasing performance. From the earliest days of racing and street build-ups, the world's best engine builders have been installing aluminum flywheels to give their engines the needed edge. Not only will you see a dramatic increase in usable horsepower, but engine life can also be extended since there will be less stress on the crankshaft. To achieve the greatest increase in performance an aluminum flywheel must lower the moment of inertia characteristics of the engine. Put in simpler terms, we must reduce the amount of horsepower needed to turn the flywheel so that horsepower can be used to turn the wheels. The flywheel itself is made from either 6061 T6 or 2024 T3 aluminum depending on the model. Both of these materials are tempered aluminum which are very, very strong yet very lightweight ------------------------------------------------------------ THIS ITEM CAN NOT BE RETURNED UNLESS THERE IS VERIFICATION BY THE FIDANZA TECH (HELP) LINE. IF THERE IS ANY PROBLEM DURING INSTALLATION CALL THE TECH LINE FOR ASSISTANCE