The Guide to Legal Car Modifications in Idaho

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Whether you live in the state or are planning to move there, Idaho has regulations that cover vehicle modifications that you must follow to ensure that your vehicle is considered street legal when you drive on the roads. The following information will help make sure you know what you can do with your modifications.

Sounds and noise

Idaho limits the noise levels that vehicles can emit from the engine/exhaust systems and the sound systems.

Sound system

Idaho does not have specific laws in place concerning sound systems in vehicles, other than that they cannot cause a nuisance or annoyance to those in a particular area, which is by its nature subjective.

Mufflers

  • Mufflers are required and must be in good working condition.

  • Mufflers can’t be altered to produce sounds louder than the original manufacturer equipment.

  • Mufflers can’t emit sound that registers more than 96 decibels when measured at a distance of 20 inches and 45 degrees from the exhaust.

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

Frame and suspension

Idaho has the following regulations in place for the vehicle frame and suspension systems:

  • Vehicles can’t exceed 14 feet in height.

  • There are no body lift kit limits providing the vehicle is within the maximum bumper height for its Gross Vehicle Weight Rating (GVWR).

  • Vehicles 4,500 pounds and under have a max front bumper height of 24 inches and rear bumper height of 26 inches.

  • Vehicles between 4,501 and 7,500 pounds have a max front bumper height of 27 inches and rear bumper height of 29 inches.

  • Vehicles between 7,501 and over 10,000 pounds have a max front bumper height of 28 inches and rear bumper height of 20 inches.

  • 4x4 vehicles with a GVWR under 10,000 pounds have a max front bumper height of 20 inches and rear bumper of 21 inches.

  • Bumper height must be a minimum of 4.5 inches.

Engine

Those living in Canyon County and in the city of Kuna, Idaho are required to pass emissions testing. These are the only engine requirements throughout the state.

Lighting and windows

Lights

  • Blue lights are not permitted on passenger vehicles.
  • Two fog lights are allowed.
  • Two spotlights are allowed.

Window tinting

  • Non-reflective tint can be applied above the manufacturer AS-1 line.
  • Front side windows and rear window must allow more than 25% of light to pass through.
  • Back side windows must allow over 20% of light through.
  • Reflective and mirrored tints can’t reflect more than 25%.

Antique/classic car modifications

Idaho requires vehicles older than 20 years to have an Idaho Classics plate. These cars can’t be used for daily commuting or driving, but use in parades, tours, club activities and exhibits is permitted.

If you want to make sure your vehicle modifications are in compliance with Idaho 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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