Iowa Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a muffler in good working order so it doesn't make excessive or unusual noise.

InfoVerified Jun 19, 2026

Your vehicle needs a muffler in good working order so it doesn't make excessive or unusual noise. Muffler cutouts and bypasses (which route exhaust around the muffler) are prohibited. Iowa sets no fixed decibel limit (Iowa Code § 321.436).

Official source: legis.iowa.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Don't get caught off guardGet a push the moment Iowa law changes — or when you cross into a state where it's different. Free.Get the free app

LawLert is an independent app, not affiliated with any government — informational only, not legal advice. Verify with a licensed attorney in your jurisdiction.