31-5-953. Mufflers.
(a) Every vehicle shall be equipped, maintained and operated so as to prevent excessive or unusual noise. Every motor vehicle shall at all times be equipped with a muffler or other effective noise suppressing system in good working order and in constant operation. No person shall use a muffler cut-out, bypass or similar device.
(b) The engine and power mechanism of every motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes or smoke.
(c) This section applies to motorcycles, motor-driven cycles, multipurpose vehicles, mopeds and off-road recreational vehicle as defined by W.S. 31-1-101(a)(xv)(K)(II) that is registered pursuant to W.S. 31-2-232.