TwinAir - PowerFlow Air Filter Kit For HondaTwin Air's PowerFlow kit comes with a rigid, lightweight, billet aluminum cage that provides a tight seal to the airbox and replaces your flimsy plastic stock cage. A Twin Air Powerflow Kit includes a pre oiled Twin Air filter, a special aluminum cage and all necessary mounting hardware. Twin Air PowerFlow Kit for 4 Stroke models: Replace your air restricting stock backfire screen with our New PowerFlow kit. The kit includes a rigid, lightweight,