The AIR4ORCE is a tunable intake system via interchangeable velocity stacks.
The AIR4ORCE tunable intake system allows the user to now change the power characteristics to suit track conditions and rider preference. Depending on the chosen velocity stack installed in the AIR4ORCE you will gain better throttle response and bottom and mid-range power (with longer velocity stack), or better throttle response and mid-range to top (with the shorter velocity stack installed). A stack of speed is a device of different lengths which is mounted to the inlet of the intake system of an engine, the carburetor or fuel injection
