It is unlawful for any person to sell, lease, rent or install any device or sell, rent, lease or operate any vehicle, engine, motor or other mechanical device with a device which when attached to or placed on any vehicle, engine, motor or other mechanical device so as to amplify or increase the noise emitted by it above that emitted by the vehicle, engine, motor or mechanical device in its original factory design. This part shall not apply to devices sold for racing or pleasure purposes and used outside the City or in areas properly authorized by the City for pleasure or racing. It is unlawful for any person to operate a modified vehicle, engine, motor or device within the City and not in a properly authorized area. (Ord. 4517; 1968 Code §8-52; Ord. 01-42)