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Arizona Exhaust & Muffler Laws (2026)
Info: Your vehicle needs a working muffler. A muffler cutout or bypass (which routes exhaust around the muffler) is prohibited, and excessive fumes or smoke are barred.
InfoVerified Jul 23, 2026
Vehicle rules change at the state line.Track them in the free LawLert iPhone app and get an alert when you cross into a state where they differ. No account.Get the appYour vehicle needs a working muffler. A muffler cutout or bypass (which routes exhaust around the muffler) is prohibited, and excessive fumes or smoke are barred. A violation carries a civil penalty. Arizona sets no fixed decibel limit (A.R.S. § 28-955).
General legal information, not legal advice — verify important decisions with a licensed attorney.
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