Fidanza Flywheel Fits 03-07 xA / xB 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. Making the flywheel lighter is not as simple as it sounds. Anyone can take the factory design and then just produce that from aluminum. At Fidanza Flywheels we take the extra effort to eliminate the weight in areas that make sense for performance. Fidanza does not sacrifice durability. Fidanza will not sell a flywheel that will not hold up to the roughest of drivers and or engines. This is where Fidanza Flywheels have the edge. Fidanza flywheels give the best increase in performance but they are also the most durable. What a concept! Anyone can claim to make a product that far exceeds industry standards but Fidanza chooses to put their money where their mouth is. From the very best materials to ground breaking new designs, Fidanza Flywheels are the finest aluminum flywheels on the market. Weight: 8lbs