The Guide to Legal Car Modifications in Wisconsin

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If you have a modified vehicle and either live in or plan to move to Wisconsin, you need to know the laws that determine whether your car or truck is street legal. The following regulations govern vehicle modifications in Wisconsin.

Sounds and noise

Wisconsin has regulations in place regarding both the sound emitted from your vehicle’s sound system and that of the muffler.

Sound systems

  • Sound systems cannot be played at levels that are considered excessive in any city, town, neighborhood, county or village. If you are charged with playing music excessively loud two or more times within three years, your vehicle can be impounded.

Mufflers

  • All vehicles must have mufflers that are designed to prevent unreasonably loud or excessive noise.

  • Cutouts, bypasses, and similar devices are not permitted.

  • Modifications that create flame inside or outside the exhaust system are prohibited.

  • Modifications to increase sound levels of the engine over that of the manufacturer are prohibited.

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

Frame and suspension

Wisconsin has restrictions on modifications to the frame and suspension:

  • 4x4 vehicles that have a Gross Vehicle Weight Rating have a 5-inch suspension lift limit.

  • Shackles can be no longer than two inches longer than stock size for the vehicle.

  • Vehicles with a Gross Vehicle Weight Rating of less than 10,000 pounds cannot have a bumper height exceeding 21 inches.

  • Bumpers must be three inches tall.

  • Vehicle can be no taller than 12 feet 6 inches.

  • Car bumpers can be lifted to within two inches of original factory height.

  • Truck bumpers must be no more than nine inches above factory height.

Engine

Wisconsin does not have any engine modification or swap regulations. There are seven counties in which emissions testing is required. Check the Wisconsin DMV website for additional information.

Lighting and windows

Lights

  • Two fog lamps are permitted.
  • Two auxiliary lamps are permitted.
  • No more than four lights can be lit at one time.
  • Two backup lamps are permitted with white or amber light.
  • Green lights are only permitted on buses and taxicabs for identification.
  • Red lamps are for authorized vehicles only.

Window tinting

  • Non-reflective tint is permitted on the top of the windshield above the AS-1 line from the manufacturer.

  • Front side windows must permit 50% of light to pass through.

  • Back side and rear window tint must allow over 25% of light to pass through.

  • Side mirrors are required with rear window tint.

Antique/classic car modifications

Wisconsin offers Collector Plates that have no restrictions for daily travel or age of the vehicle.

If you want to make sure the modifications on your vehicle are in compliance with the laws in Wisconsin, 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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