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New Hampshire Exhaust & Muffler Laws (2026)

Info: Muffler required in good working order; cutouts/bypasses and straight-pipe exhaust prohibited; no car dB limit (266:59-a dB is motorcycles only) — N.H. RSA §266:59.

InfoVerified Jun 19, 2026

Muffler required in good working order; cutouts/bypasses and straight-pipe exhaust prohibited; no car dB limit (266:59-a dB is motorcycles only) — N.H. RSA §266:59.

Official source: gencourt.state.nh.us →

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