Exhaust Noise in Michigan
Michigan sets real numeric limits: 76 dBA at 35 mph or less and 82 dBA above that, measured at 50 feet, plus a stationary run-up limit of 95 dBA measured 20 inches from the tailpipe.
Verified against primary sources · August 2026
What the law says
Heavy vehicles are held to 86 and 90 dBA and motorcycles to 82 and 86 dBA. Michigan's stationary test is the origin of many '95 dB at 20 inches' claims that get misattributed to other states.
Specific Limits
- Other
- heavy vehicles 86/90 dBA; motorcycles 82/86 dBA
- Measured at
- 50 feet
- dB limit cars
- 76 dBA at 35 mph or less; 82 dBA above 35 mph
- Stationary run up
- 95 dBA at 20 inches from the tailpipe
Exceptions & Exemptions
Maximum 95 dB measured at 20 inches from exhaust outlet at engine speeds producing maximum noise. Exhaust systems must not bypass original equipment mufflers. Open headers, straight pipes, and gutted mufflers are prohibited.
Frequently Asked Questions
Are exhaust noise legal in Michigan?
What are the exact exhaust noise limits in Michigan?
Are there exceptions for exhaust noise in Michigan?
Street-legal exhaust noise picks
Gear that helps you mod without a ticket in Michigan.
Measure your exhaust at the test RPM before a fix-it ticket does.
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