Skip the auto shop - Our mechanics make house calls

The Guide to Legal Car Modifications in Michigan

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

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 35 MPH or more, 86 decibels at 35 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 13 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 30 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 300 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 35%.

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.

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

Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...


Related questions

Q: Packing power. Looking to add more off-road performance.

If you want to add some more power easily to your vehicle I would recommend an intake system or an exhaust system or both. The intake system and the exhaust system are two of the easiest ways to add power...

Q: Will a after market performance chip increase my horse power? Will it pass smog?

If you live in California or any jurisdiction that regulates these aftermarket products, the first thing to check is whether the California Air Resources Board (CARB) has "registered" or "approved" the product. If no approval exists, particularly in California, that...

Q: I am looking to make a "sports" , "dub" car with alot of power.

Taking on a project such as this takes lots of time, even for the most experienced mechanic. You will be re-engineering your car and this will require you to learn a lot and make a lot of decisions. There is...