Minnesota Guide to Legal Vehicle Modifications
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Whether you currently live in the state or plan to move to Minnesota in the near future, you need to make sure you understand the restrictions on vehicle modifications. The following will help you understand what requirements you must meet to make sure your vehicle is road legal.
Sounds and noise
The state of Minnesota has regulations regarding the sounds your vehicle makes.
Audio system
- 60-65 decibels in residential areas from 7 a.m. to 10 p.m.
- 50-55 decibels in residential areas from 10 a.m. to 7 p.m.
- 88 decibels when stationary
Muffler
Mufflers are required on all vehicles and must work properly.
Muffler cutouts are not permitted.
Vehicles traveling at 35 mph or less cannot be louder than 94 decibels within 2 feet of the center lane.
Vehicles traveling faster than 35 mph cannot be louder than 98 decibels within 2 feet of the center lane.
Functions: Also check your local Minnesota laws to make sure you comply with any municipal noise ordinances that may be stricter than state laws.
Frame and suspension
Minnesota has no frame height or suspension modification restrictions as long as the vehicle meets the following requirements:
Vehicles cannot be taller than 13 feet 6 inches.
Bumper height is limited to within six inches of the vehicle's original factory bumper height.
4x4 vehicles have a maximum bumper height of 25 inches.
ENGINES
Minnesota does not require emissions testing and has no restrictions on engine replacement or modification.
Lighting and windows
Lanterns
Lights over 300 candles cannot enter the roadway 75 feet in front of the vehicle.
Flashing lights (other than emergency lights) are not allowed.
Red lights are allowed for braking only on passenger cars.
Blue lights are not allowed on passenger cars.
Window tinting
Windshield tinting is prohibited.
The front side, rear side and rear windows must let in more than 50% of the light.
Reflective tinted front and rear side windows cannot reflect more than 20%.
A sticker indicating the permitted tinting must be located between the glass and the film on the glass on the driver's side.
Vintage/classic car modifications
Minnesota does not permit the use of vehicles intended for collectors with license plates as general or everyday transportation. These numbers are available for cars over 20 years old.
If you want to make sure your modifications are within Minnesota laws, AvtoTachki can provide mobile mechanics to help you install new parts. You can also ask our mechanics what modifications are best for your vehicle using our free online Ask a Mechanic Q&A system.
