Skip the auto shop - Our mechanics make house calls

The Guide to Legal Car Modifications in South Dakota

The Guide to Legal Car Modifications in South Dakota ARENA Creative / Shutterstock.com

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 30 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 35% 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...


Related questions

Q: Outside of an engine rebuild, what can I do to get high-end horsepower rather than the low-end torque inherent with american cars?

Hello. Due to the design of the engine, there's not much that can be done, aside from completely rebuilding the engine, to achieve high rpm power. Typically V layout engines are designed to provide low end torque and a smooth...

Q: What kind of modification/performance can I do to my car?

Hello - the best way to keep your Altima running like new is "attentive maintenance". Keep fluids (oil, transmission fluid, coolant) topped off and changed at recommended intervals. If your timing chain and associated components (tensioner, idler, chain guides, etc.)...

Q: Power capabilities

Hi there. The engine will not start to break down or lose power at that point. The factory engine does not make that much power on its own so I have to assume you are talking about aftermarket power modifications....