South Dakota Codified Laws
§ 32-15-17. Exhaust system and muffler requirements -- Class 2 misdemeanor
No person may drive a motor vehicle on a highway unless the motor vehicle is equipped with an exhaust system and a muffler both in good working condition and in constant operation to prevent excessive or unusual noise.
Exhaust systems on passenger or passenger-carrying vehicles used on any highway shall discharge the exhaust fumes at a location to the rear of the vehicle body or direct the exhaust fumes outward from the side of the vehicle body at a location rearward of any operable side windows. Any motor vehicle equipped with side exhaust according to the original vehicle manufacturer specifications is exempt from the location requirements. A bus used for the purpose of carrying school children may discharge the exhaust on the left side in front of the rear axle.
Exhaust systems on property-carrying vehicles used on any highway shall discharge the exhaust fumes at a point rearward of the passenger-carrying compartment.
No person may use a muffler cut-out on any motor vehicle upon a highway.
A violation of this section is a Class 2 misdemeanor.
Historic
Available for vehicles that are more than 30 years old and not used for general transportation purposes.
special interest
Available for a vehicle that is collected, preserved, restored, or maintained by the owner as a leisure pursuit and is not used for general or commercial transportation. The special interest motor vehicle license plate may be placed on any automobile, pickup, truck, or van that qualifies as a special interest motor vehicle.
YOM
Vehicles that are more than 30 years old and only driven on special occasions such as displays, parades and exhibitions are eligible to display YOM plates with DMV approval.
*For a vehicle to qualify to display only a rear plate it must be driven less than 7,500 miles a year, and only to be used for occasional transportation. You must provide the current odometer reading of the vehicle.