The Guide to Legal Car Modifications in Montana

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Whether you currently live in Montana or plan to move there, you will need to know the regulations that govern modified vehicles. The following information will help ensure that the modifications you make to your car or truck are street legal when driving on the roads in Montana.

Sounds and noise

Montana has certain restrictions on the sound systems and mufflers that are used on vehicles on the roadways.

Sound system

Montana does not have specific guidelines regarding sound systems in vehicles.

Mufflers

  • Mufflers are required on all vehicles, must work properly, and must prevent unusual or excessive noise.

  • Muffler bypasses, cutouts, and similar devices that amplify sound are not permitted.

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

Frame and suspension

Montana does not have any restrictions as far as bumper height, frame height or suspension height limits. However, vehicles cannot be more than 14 feet in height.

Engine

Montana does not have performance modification regulations for engines or engine swap guidelines. The state also does not require emissions testing.

Lighting and windows

Lights

  • Reflectors and marker lamps on the front or near the front of the vehicle must be amber in color.

  • White lights are required for illuminating license plates.

  • Backup lamps must emit white light.

  • Red lamps are not permitted on the front of passenger vehicles.

  • Decorative license plate lighting and undercarriage lighting that flashes or rotates or is not amber or white cannot be illuminated when vehicle is in motion on streets or highways.

Window tinting

  • Non-reflective tint is permitted above the AS-1 line provided by the manufacturer.
  • Front side windows must allow over 24% of light through.
  • Back side and rear window must allow over 14% of light through.
  • Front side and back side window reflective tint cannot reflect more than 25%.
  • Stickers identifying legal tint are recommended by law but not required.

Antique/classic car modifications

If you want to make sure your modified car or truck is street legal in Montana, 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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