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Wisconsin Exhaust & Muffler Laws (2026)

Info: Adequate muffler in constant operation required; cutouts/bypasses and mods amplifying noise above factory muffler prohibited (no fixed dB) — Wis.

InfoVerified Jun 19, 2026

Adequate muffler in constant operation required; cutouts/bypasses and mods amplifying noise above factory muffler prohibited (no fixed dB) — Wis. Stat. §347.39.

Official source: docs.legis.wisconsin.gov →

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