Features:Dual saver fan spins with the engine speed while generating a maximum force that creates powerful airflow into the combustion chamber at high speedThe propeller sucks the airflow into the combustion chamber at a higher speed resulting atomized burning which increase horse power and saves gasolineRubber holder can increase the diameter of fan for fitting in the tubeMaximum Speed Movement: 55，000R / MinSize (Dia. x L): Approx. 2.5 x 2.95 inch / 6.4 x 7.5 cmBody Diameter with Rubber Holders Wrapped on: Approx. 2.8 inch / 7 cmMaterial: Aluminum alloy and rubberColor: BlueInstallation:Remove air inlet hose located between air purifierPut the intake fan into the air inlet hoseUse rubber holder attached to fit into the tube with a larger diameterPackage Includes:1 x Fuel Saver Fan3 x Rubber Holder