The Guide to Legal Car Modifications in Colorado

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Whether you currently live in Colorado and want to modify your car or you are moving to the area and want to ensure your vehicle is street legal, you need to know the laws and regulations throughout the state. Below you will find out what you need to know to make sure your vehicle is legal on Colorado roadways.

Sounds and noise

Your sound system and muffler must meet certain requirements in Colorado in order to avoid fines.

Sounds system

Colorado regulations limit the decibel levels in specific areas. These include:

  • Residential - 55 decibels between 7 AM and 7 PM, 50 decibels between 7 PM and 7 AM

  • Commercial - 60 decibels between 7 AM and 7 PM, 55 decibels between 7 PM and 7 AM

Mufflers

Colorado muffler modification laws include:

  • Vehicles with a gross vehicle weight over 6,000 pounds and produced prior to 1972 can’t produce noise that exceeds 88 decibels at 25 MPH or less or 90 decibels between 25 and 55 MPH.

  • Vehicles with a gross vehicle weight over 6,000 pounds and produced after January 1, 1972 can’t produce noise that exceeds 86 decibels at 25 MPH or less or 90 decibels between 25 and 55 MPH.

  • All vehicles must have a working muffler.

  • Bypasses and cutouts are not permitted.

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

Frame and suspension

Colorado frame and suspension laws include:

  • Suspension modifications cannot alter the type that was originally used by the manufacturer.
  • Vehicles can’t exceed 12 feet in height.

Engine

Colorado has regulations regarding engine modifications as well:

  • Engine swaps must be done with engines that are the same year or newer.

  • Gasoline engines that are over three model years old are required to pass emissions tests.

Lighting and windows

Lights

  • Vehicles can have no more than two spot lamps.

  • Vehicles can have no more than two fog lamps.

  • One running board courtesy lamp is permitted per side in white or amber.

  • No more than four lamps greater than 200 candlepower can be lit at a single time on the highway.

Window tinting

  • Non-reflective tint is allowed on the top four inches of the front windshield.
  • Front side and back side windows must allow over 27% of the light through.
  • Rear window must allow over 27% of light through.
  • Mirrored or metallic tint is not permitted.
  • Amber or red tint is not permitted.
  • Two side mirrors are required if the back window is tinted.

Antique/classic car modifications

Colorado only requires that antique, classic and custom-built vehicles be registered at your local county DMV location.

If you’re considering modifying your car to be within the laws in Colorado, 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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Arturo

25 years of experience
42 reviews
Arturo
25 years of experience
Volkswagen Tiguan - Brake Pads Replacement (Rear) - La Jolla, California
Arturo was efficient and extremely professional. I'll refer him to friends and family and call him for any issues related to my car. I am very happy with the service!
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

Travis

11 years of experience
312 reviews
Travis
11 years of experience
Ford Explorer Sport Trac - Brake Pads Replacement (Rear) - Minneapolis, Minnesota
Travis is great! This is the second time he has come and serviced our truck. I recommend Travis for any service ned you may have!
Subaru Forester - Brake Pads Replacement (Front, Rear) - Rosemount, Minnesota
Thank you Travis for your fast, easy, honest work on my vehicle today!! The first thing you did upon arrival to my home was find me a discount coupon for $50 off my service estimate. You did only what needed to be done in record time. You not only saved me lots of money, but did things in a profession manner. I've been looking for an honest auto mechanic for my whole life and would love for you to be it!! Thank you, thank you, thank you!! You're the best!!!

Scott

32 years of experience
346 reviews
Scott
32 years of experience
Hyundai Sonata - Brake Pads Replacement (Front, Rear) - Denver, Colorado
Arrived on time and worked quickly. Gave me detailed information on his completed work and the details of my car. Answered all of my questions thoroughly.
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!

Nicholas

9 years of experience
251 reviews
Nicholas
9 years of experience
Lexus GX470 - Brake Pads Replacement (Rear) - Clayton, North Carolina
Nicholas texted me 30 minutes prior to arrival. Showed up on time as scheduled. He confirmed the work that I requested be performed. He completed the work, performed the road tested, and delivered my keys along with recommendations of other work that might be in my best interest. Was very pleasant, professional, and cleaned up after he was done. I was so impressed with the service he performed and the speed at which the services were completed. I have already scheduled a future service with Nicholas and will schedule any and all future repairs with him if he is available.

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