Section 61-9-403 - Mufflers - prevention of noise(1) 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 cutout, bypass, or similar device upon a motor vehicle on a highway.(2) 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.En. Sec. 143, Ch. 263, L. 1955; R.C.M. 1947, 32-21-146.