Wotefusi Car New Universal Supercharger Dual Double Turbine Air Intake Fuel Saver Turbo Turboing Charger Fan Set Kit The Dual Propeller Of Turbo Fan Intake Fuel Saver spins with the engine speed while generating a maximum force that creates powerful airflow into the combustion chamber at high speed. The propeller sucks the airflow into the combustion chamber at a higher speed resulting atomized burning which increase horse power and saves gasoline. Length: 75mm Inner Diameter: 60mm Outer Diameter: 64mm 1.Remove air inlet hose located between air purifier. 2.Put the Intake Fan into the air inlet hose. 3.If the Intake Fan is smaller than the air inlet hose, use the rubber holder attached to increase its diameter so it can fit in the tube.