§47-12-402.

§47-12-402.
   
   Every motor vehicle shall at all times be equipped with a muffler in
   good working order and in constant operation to prevent excessive or
   unusual noise and annoying smoke, and no person shall use a muffler
   cut-out, bypass or similar device upon a motor vehicle on a highway.
   No person shall modify the exhaust system of a motor vehicle in any
   manner which will amplify or increase the noise or sound emitted
   louder than that emitted by the muffler originally installed on the
   vehicle.