Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

This 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 airstreamto allow enhanced fuel atomization in the combustion chamber， resulting in significant increase inhorsepower and better gas / fuel millage.With simple installation steps， you can enjoy going faster and furtherer whilst saving gasoline allat the same time!Length:75mm / 2.95 inchDiameter:64mm / 2.519 inchColor: black / bluePackage include:1 x Supercharger