Features: 100% brand new and high qualityThis Double Propellers Fuel Saver Turbonator Fan provides a more dynamic control over the intake systemBy forcing powerful airflow into the combustion chamber at a high speed.Once the engine is started， the propellers spin to create a maximum turbulence in the incoming air streamTo allow enhanced fuel atomization in the combustion chamber， resulting in significant increase in horsepower and better gas / fuel millage.With simple installation steps， you can enjoy going faster and furtherer whilst saving gasoline all at the same time!Easy to installLength:74mm / 2.91 inchDiameter:64mm / 2.519 inchColor: blue Package Contents:1 x Supercharger Turbo3 X Rubber ring