Abstract: In an internal combustion engine, an air filtration assembly provides a large frustoconical air filter positioned within an intake velocity stack affixed to its mouth. The air filter medium is located along the inside walls of the velocity stack throughout a substantial portion of its length. A funnel plate secures the filter to the body of the velocity stack and directs incoming air into the center of the filter. Air filtration surface area is maximized while providing a concealed air filter assembly that does not detract from the aesthetic appearance of the velocity stack.