The Guide to Legal Car Modifications in Connecticut

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If you live in Connecticut or are planning to move to the state and want to modify your vehicle, you need to know what the law allows to ensure you are street legal. Below you will find what modifications the state allows.

Sounds and noise

Connecticut limits the amount of noise that your vehicle can emit through the sound system and muffler.

Sound system and muffler

Connecticut limits the decibel levels based on the Gross Vehicle Weight Rating (GVWR), speed and year of manufacture. These regulations apply to both the sound system and muffler.

  • Manufactured prior to 1979 and under 10,000 pounds, 76 decibels at 25 MPH or less, 82 decibels at 25 MPH or higher

  • Manufactured after January 1, 1979 and under 10,000 pounds, 72 decibels under 25 MPH, 79 decibels at 25 MPH and above

  • Manufactured prior to 1979 and over 10,000 pounds, 86 decibels at 25 MPH or less, 90 decibels at 25 MPH or higher

  • Manufactured after January 1, 1979 and over 10,000 pounds, 82 decibels under 25 MPH, 88 decibels at 25 MPH and above

  • Additionally, mufflers are required, and can’t have bypasses or cutouts installed.

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

Frame and suspension

Connecticut laws concerning the frame and suspension of vehicles include:

  • Suspension modifications can’t exceed four inches of lift.

  • Frames can be any height but must be in good condition.

  • Vehicles can’t exceed 12 feet 6 inches in height.

  • Hydraulic shock systems are not permitted for raising or lowering the vehicle.

Engine

In Connecticut, vehicles must pass vehicle emissions tests. Additionally, if pressurized gas is the fuel source, the vehicle must display a sign saying “Pressurized Flammable Gas” in 2-inch block letters as close to the tank as possible.

Lighting and windows

Lights

  • All lights visible from the front of the vehicle must be white.

  • All lights visible from the rear of the vehicle must be red.

  • Lights visible on the sides must be yellow or amber.

  • Lights over 200 candlepower can only come on with the tail lamps and can’t be used on the road.

Window tinting

  • Reflectivity must be under 27%.

  • Front side and back side windows must allow over 25% of the light through.

  • Rear window tint in any darkness is permitted with two side mirrors.

  • Vehicles with tinted windows must have a compliance sticker affixed that is provided by the Department of Motor Vehicles.

Antique/classic car modifications

Connecticut requires antique or classic cars and custom-built vehicles to be registered and titled.

If you want to modify your vehicle but want to be in compliance with Connecticut 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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