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337.20 MUFFLER; MUFFLER CUTOUT; EXCESSIVE SMOKE, GAS OR NOISE.
(a) Every motor vehicle and motorcycle with an internal combustion engine shall at all times be equipped with a muffler which is in good working order and in constant operation to prevent excessive or unusual noise, and no person shall use a muffler cutout, by-pass or similar device upon a motor vehicle on a highway. Every motorcycle muffler shall be equipped with baffle plates.
(b) No person shall own, operate or have in the person’s possession any motor vehicle or motorcycle equipped with a device for producing excessive smoke or gas, or so equipped as to permit oil or any other chemical to flow into or upon the exhaust pipe or muffler of such vehicle, or equipped in any other way to produce or emit smoke or dangerous or annoying gases from any portion of such vehicle, other than the ordinary gases emitted by the exhaust of an internal combustion engine under normal operation.
(c) Whoever violates this section is guilty of a minor misdemeanor.