28-955.01. Motorcycles; noise level equipment; unauthorized equipment A. A person shall not operate or as an owner allow the operation of a motorcycle in this state that is not equipped with the manufacturer's original muffler or other original noise reduction equipment or with a replacement muffler or replacement noise reduction equipment capable of reducing the noise levels below the maximum operating noise levels established pursuant to 40 Code of Federal Regulations section 205.152. B. A person shall not use a muffler cutout, bypass or similar device on a motorcycle operated in this state.
Arizona Legal Code