The Guide to Legal Car Modifications in South Dakota

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If you live in South Dakota or plan to do so in the near future, you need to be aware of the laws that cover vehicle modifications. Understanding and complying with the following laws will help keep your vehicle street legal when driving on South Dakota roads. Failing to comply with these standards can be considered a class 1 or class 2 misdemeanor, with fines ranging from $500 - $1,000 and/or 20 days to 1 year in jail.

Sounds and noise

South Dakota does place limitations on the amount of sound that vehicles can produce.

Sound systems

South Dakota does not have specific guidelines for sound systems. However, it is unlawful to cause annoyance, inconvenience or alarm due to unreasonable noise levels. These levels, however, are subjective and not clearly defined.

Mufflers

  • Mufflers are required on all vehicles and have to prevent unusual or excessive noise.
  • Motor vehicles with exhaust cutouts are not permitted on the highways.

Tip: Always check with local county laws in South Dakota to make sure you are following any municipal noise ordinances that may be more stringent than state-level laws.

Frame and suspension

South Dakota does not restrict frame height, suspension lift height or bumper height. However, vehicles cannot exceed 14 feet in height.

Engine

South Dakota does not have any engine modification or swap regulations and does not require emissions testing.

Lighting and windows

Lights

  • License plates on the rear of vehicles must be illuminated with white light.

  • Red, blue, and green lights are permitted on authorized vehicles only, not passenger vehicles.

  • One spot lamp is permitted that does not hit the road surface over 100 feet in front of the vehicle.

  • Amber flashing lights are permitted within three inches of the license plates for drivers with disabilities. These lamps can only be used when the disabled driver is the person operating the vehicle.

Window tinting

  • Non-reflective tint is permitted on the windshield above the AS-1 line from the manufacturer, or to the lowest level of the sun visor when flipped down.

  • Mirrored and metallic/reflective tints are not permitted.

  • Front side windows must allow over 25% of the light to pass through.

  • Back side and rear windows must let more than 20% of light to pass through.

  • Sticker identifying legal tint levels is required on each tinted window between the glass and film.

Antique/classic car modifications

South Dakota offers historical vehicle plates that have the following requirements:

If you want to make sure your vehicle is street legal under the laws in South Dakota, YourMechanic can provide the mobile mechanics to help you install the new parts. You can also ask our mechanics what modifications may be best suited to your car using our free online Q&A system, Ask a Mechanic.


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Rigoberto

9 years of experience
706 reviews
Rigoberto
9 years of experience
Chevrolet Equinox - Brake Pads Replacement (Rear) - Niles, Illinois
Rigo was great! He got there early, finished the job early, left everything clean. He changed my rear pads and rotors. The original quoted time was 90 minutes, he was done in about 60. He knows what he is doing and I am recommending him to all my friends and coworkers.
Mercedes-Benz C250 - Brake Pads Replacement (Front, Rear) - Chicago, Illinois
Rigo is a maverick hands down. Don’t take your car for work elsewhere. Especially great at Mercedes—this guy knows his profession! I will be using him for everything related to my car going forward.

Arturo

25 years of experience
35 reviews
Arturo
25 years of experience
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto
Nissan Maxima - Brake Pads Replacement (Front, Rear) - San Diego, California
Arturo was prompt and completed my brake repair, including new rotors in a very efficient manner. I am very pleased with the quality of the work and the parts and will definitely look to have him service our other car in the near future.

Scott

32 years of experience
345 reviews
Scott
32 years of experience
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Michael

10 years of experience
15 reviews
Michael
10 years of experience
Nissan Sentra - Brake Pads Replacement (Front) - Conyers, Georgia
He was promptly on time and got the job done efficiently in a timely manner. I really appreciate the rapid respone on getting the job done! I would most definitely use this service again.

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