Abstract: Present embodiments provide a disruptive air flow assembly which connects to a vacuum line and utilizes a valve to open and close and thereby vary the vacuum pressure in the vacuum line. This affects air flow into the engine which is utilized for combustion and therefore causes the engine to vary the engine sound by running roughly at a preselected engine speed. A vacuum fitting may house the valve to vary air flow by opening and closing inlets in the fitting. A motor may be utilized to move the valve between the open and closed positions.