Section 257.707b - Exhaust system; requirements(1) A motor vehicle, while being operated on a highway or street, shall be equipped with an exhaust system in good working order to prevent excessive or unusual noise and shall be equipped to prevent noise in excess of the limits established in this act.(2) For purposes of sections 707a to 707f, a motor vehicle does not include a special mobile equipment.Add. 1978, Act 73, Imd. Eff. 3/21/1978 .