The Handbook of Michigan Off-Road Vehicle Laws
The Official Off-roading Handbook of the Michigan Department of Natural Resources - Web Version
Table of Contents
Sound Emission Regulations
Excessive noise is a common complaint made against ORV users.
All ORVs must have, in good working condition and in constant use, a muffler that will meet or exceed all sound emission standards set by state law.
Exhaust noise must not exceed 99 dB(A)—or 94 dB(A) on vehicles manufactured after January 1, 1986—when tested according to the provisions of the SAE J1287 test. (Refer to the manufacturer's documentation.)
Users should replace all worn or damaged exhaust systems with a quality muffler.
Motocross motorcycles are designed for closed course competition and not for recreational riding. These vehicles must be modified before being operated on public trails, routes, or land.