Brand N/A Quantity 1 piece(s) Color Silver Function Double turbine installed on the engine air intake hose the engine is started according to the normal use of natural air intake engine inertia force at the same time in the rotation of the drive in plenty of fresh air into the engine continuously when high-speed rotating and force the intake air to produce eddy current can make the high-speed rotating air mixed with the nozzle jet fuel can enhance the density of air inside mixture can greatly increase efficiency and on combustion would produce greater power unexpectedly and improve dynamic effect; Inner diameter: 6.0cm; External diameter: 6.5cm; Length: 7.5cm Packing List 1 x Turbine 3 x Rubber collars