None.
West Virginia Code
§ 17C-15-34. Mufflers; prevention of noise, fumes and smoke.
(a) 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. Such muffler shall be the muffler originally installed by the manufacturer of the vehicle or, if a replacement, the equivalent thereof. No person shall use a muffler cutout, bypass, or similar device upon a motor vehicle on a highway.
(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.
Antique
Available for vehicles that are more than 25 years old and owned solely as collector's items.
Classic Car
Available for vehicles that are more than 25 years old, registered annually as everyday vehicles, and used for general transportation.
YOM
Vehicles manufactured more than 25 years ago may display YOM plates with DMV approval.
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