The Guide to Legal Car Modifications in Michigan

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If you live in Michigan or are planning on moving to the area, you need to know about the vehicle modification laws in the state. Following these modification regulations will help ensure that your vehicle is street legal when driving throughout the state.

Sounds and noise

Michigan has regulations concerning the sound system and the muffler on your vehicle.

Sound system

  • 90 decibels when traveling 25 MPH or more, 86 decibels at 25 MPH or less.
  • 88 decibels when stationary.

Mufflers

  • Mufflers are required on all vehicles and must work properly with no holes or leaks.

  • Muffler cutouts, amplifiers, bypasses or other modifications that are designed to amplify the sound are not permitted.

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

Frame and suspension

Michigan has the following regulations on frame and suspension height:

  • Vehicles cannot be taller than 12 feet 6 inches.

  • Vehicles cannot have tie rods, drag links or pitman arms welded to the vehicle to affect steering.

  • Front lift blocks are not permitted.

  • One-piece rear lift blocks with a height of four inches or less are permitted.

  • Spring shackles longer than two inches beyond stock length are not permitted.

  • Vehicles with GVWR less than 7,500 have a maximum frame height of 24 inches.

  • Vehicles with a GVWR of 7,501-10,000 have a maximum frame height of 26 inches.

  • Vehicles with a GVWR of less than 4,501 have a maximum bumper height of 26 inches.

  • Vehicles with a GVWR of 4,-7,500 have a maximum bumper height of 28 inches.

  • Vehicles with a GVWR of 7,501-10,000 have a maximum bumper height of 20 inches.

Engine

Michigan does not have engine modification or swap regulations and does not require emissions testing.

Lighting and windows

Lights

  • No more than 4 lights of 200 candlepower can be lighted at one time of the highway.

  • Markers lamps, reflectors and clearance lamps on the front of the vehicle must be amber.

  • All rear lighting and reflectors must be red in color.

  • License plate light must be white.

  • Two side fender or cowls lamps in white or amber light are permitted.

  • One running board light per side in amber or white are permitted.

  • Flashing or oscillating lights (other than amber hazard lights) are not permitted on passenger vehicles.

Window tinting

  • Non-reflective tint can be applied to the top four inches of the windshield.

  • Front side, back side and rear windows can have any tint darkness.

  • Side mirrors are required if back window is tinted.

  • Front side and back side window reflective tint cannot reflect more than 25%.

Antique/classic car modifications

Michigan requires those with historic vehicles to fill out an Application and Certification for Michigan Historic Plates. Additionally, these vehicles are not allowed to be used for normal, daily transportation.

If you want to make sure your modifications are within Michigan 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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