Mich. Comp. Laws § 750.420

Sec. 420. Motor vehicles equipped with smoke or gas producing devices—Any person who shall own, operate or have in his possession any motor vehicle 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 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, shall be guilty of a felony.