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Mont. Code Ann. § 61-9-435

Exhaust noise limitation

En

(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 source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.