Product Name: Intake Fan : Double Impeller Material: Metal Size: Inner diameter 6.0cm, Outer diameter 6.5cm, Length 7.5cm Note: The diameter of the intake pipe is greater than 6.4cm, you can directly plug the tube, less than 6.4cm, the need to change the tube can be installed. The double-sided impeller is installed on the intake pipe of the engine. When the engine starts normally, the inertial tension of the engine intake is used to drive the high-speed rotation of the space wheel disc, and a large amount of fresh air is continuously drawn into the engine during rotation. , At the same time, also according to the forced way into the air to produce eddy current, so that the high-speed rotation of the air can be sprayed with a fuel injection nozzle, but also can greatly improve the air pipe in the air density, the mixing efficiency will be greatly increased, in the combustion will have greater force, actually played a way to improve the power. installation: Double-sided turbo installed