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Mont. Code Ann. § 61-9-435

Exhaust noise limitation

(1) Except as provided in subsection (2), a person may not operate a motor vehicle with an exhaust system that emits a noise in excess of 95 decibels, as measured by the society of automotive engineers' standard j1169 (May 1998).

(2) This section does not apply to a motorcycle or quadricycle that is subject to 61-9-418.

Official Annotations archive.org, 2025 edition
History:
En. Sec. 5, Ch. 329, L. 2007 (HB 737 - Hilbert, Edward (R) HD 38)
Amd. Sec. 1, Ch. 378, L. 2025