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From the people that brought you the VForce3 reed valve system we are now proud to introduce the AIR4ORCE tunable intake system! The AIR4ORCE is a tunable intake system via interchangeable velocity stacks. It 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). Included is a Moto Tassinari product line brochure, Moto Tassinari and AIR4ORCE decals, detailed installation instructions, two velocity stacks, AIR4ORCE tunable intake system and hose clamps & gaskets where necessary.