The Guide to Legal Car Modifications in Missouri

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If you live in Missouri and want to modify your vehicle, or if you are moving to the state with a car or truck that you have customized, it is important that you know the laws to make sure your vehicle is street legal. The following are the most important regulations for keeping your vehicle within the laws in Missouri.

Sounds and noise

The following are the laws regarding vehicle sound systems and mufflers in Missouri.

Sound system

Missouri does not have specific guidelines on sound systems other than that the noise emitting from a vehicle cannot be considered a nuisance or injurious to the welfare or health of the people who live within city limits or within a half mile of city limits.

Mufflers

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

  • Muffler cutouts are not permitted.

  • Any muffler openings present must be attached in such a way that they cannot be turned on or opened while vehicle is in motion.

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

Frame and suspension

Missouri does not have any restrictions on frame height or suspension lifts, but it does restrict bumper height.

  • GVWR under 4,501 – Front bumper height maximum is 24 inches, rear is 26 inches.
  • GVWR 4,501-7,500 – Front bumper height maximum is 27 inches, rear is 29 inches.
  • GVWR 7,501-9,000 – Front bumper height maximum is 28 inches, rear is 20 inches.
  • GVWR 9,002-11,500 – Front bumper height maximum is 29 inches, rear is 21 inches.

Engine

Missouri does not currently list engine modification or swap regulations. However, St. Charles, St. Louis, Franklin and Jefferson Counties require emissions testing.

Lighting and windows

Lights

  • Three auxiliary lamps are permitted on the front, mounted between 12 inches and 42 inches.

  • White lights are required for illuminating license plates.

  • Two fender or side cowl lamps are permitted that emits yellow or white light.

  • One running board courtesy lamp is permitted that emits yellow or white light.

  • One spotlight is permitted that does not glare on or dazzle another person.

Window tinting

  • Non-reflective tint is permitted above the AS-1 line provided by the manufacturer.
  • Front side windows must allow over 25% of light through.
  • Back side and rear window can have any darkness.
  • Front side and back side window reflective tint cannot reflect more than 25%.
  • Side mirrors are required if back window is tinted.

Antique/classic car modifications

Missouri cars can be listed as historic if they are 25 years or older. Vehicles with historic plates:

  • Have no mileage limitations when driven to and from educational or exhibition events.
  • Can be driven to repair locations within 100 miles.
  • Have a 1,000 mile per year limit for personal use.

If you want to make sure your modifications are within Missouri laws, 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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