Greeley, CO Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Applies to
- all registered motor vehicles
- Prohibited
- cut-off/bypass exhaust devices
- Also prohibited
- mods that amplify exhaust noise
- Code section
- Greeley Municipal Code § 16-58
Summary
Greeley requires every registered motor vehicle to run a maintained, unmodified muffler at all times, banning cut-off or bypass devices and any exhaust change that amplifies noise beyond what the original factory muffler produced.
Every motor vehicle subject to registration and operated on a highway shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no such muffler or exhaust system shall be equipped with a cut-off, bypass or similar device. No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle...
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 6 Update 1).
Full Breakdown
Municipal Code § 16-58 makes an adequate, properly maintained muffler mandatory on any motor vehicle operated on a Greeley street, and it specifically bans cut-off, bypass, or similar devices that let exhaust skip the muffler. It also separately bars modifying the exhaust system so it emits more noise than the vehicle's original factory-installed muffler did, so a louder aftermarket system is a violation even without a decibel meter. This is a Municipal Code section, current through the code's April 2026 supplement, not a general state statute.
Violations & Fines
Driving with a cut-out, bypassed, straight-piped, or otherwise modified exhaust that's louder than the factory setup is a traffic offense Greeley police can cite under § 16-58, whether or not the loudness is measured in decibels.
Frequently Asked Questions
Does Greeley set a decibel limit for exhaust noise?
Can I put an aftermarket exhaust on my car in Greeley?
Sources & Official References
Other rules in Greeley
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