← Connecticut driving laws›Exhaust & Muffler

Connecticut Exhaust & Muffler Laws (2026)

Info: You can't install or use a gutted muffler, a muffler cutout, a straight exhaust, or a muffler missing its interior baffle plates — the only exception is a sanctioned race or public exhibition.

InfoVerified Jul 28, 2026

Vehicle rules change at the state line — and in your state.Track them in the free LawLert iPhone app: it alerts you when you cross into a state where they differ, and when they change in your state. No account.Get the app

You can't install or use a gutted muffler, a muffler cutout, a straight exhaust, or a muffler missing its interior baffle plates — the only exception is a sanctioned race or public exhibition. Any vehicle with an internal-combustion engine needs a muffler in good working order that's in use whenever the vehicle is running, and every vehicle has to be operated, equipped and adjusted so it doesn't make unnecessary or unusual noise. Maximum noise levels are set by DMV regulation under C.G.S. Sec. 14-80a (C.G.S. Sec. 14-80).

Official source: cga.ct.gov →

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

Exhaust & Muffler in states bordering Connecticut

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

MassachusettsInfo
Your vehicle needs a muffler in good working order that prevents excessive noise, and cutouts, bypasses (which route exhaust around the muffler), removed baffles, and noise-amplifying exhaust are banned. Massachusetts sets no fixed decibel limit (M.G.L. c.90 § 16).
Verified Jun 19, 2026 · Source: malegislature.gov · Full Massachusetts rule →
New YorkInfo
Your vehicle needs a muffler. Passenger cars up to 10,000 pounds are capped at 76 decibels at 35 mph or below, and 82 decibels above that, measured at 50 feet (N.Y. Veh. & Traf. Law § 386).
Verified Jun 19, 2026 · Source: nysenate.gov · Full New York rule →
Rhode IslandInfo
Every vehicle needs a muffler in good working order and running at all times so it doesn't make excessive or unusual noise, muffler cutouts and bypasses (which route exhaust around the muffler) are prohibited on highways, and an exhaust system modified to be louder than the manufacturer's original equipment counts as defective. …
Verified Jul 27, 2026 · Source: webserver.rilegislature.gov · Full Rhode Island rule →

Don't get caught off guardCross into a state where this law is different and the free iPhone app tells you what changed, even with the app closed. It also alerts you when a law you track changes where you live. No account.Get the free app

Track this law — get alerted when it changes

We watch the official sources behind Connecticut vehicle rules. If a tracked rule changes, you get one short email — never more than one a week. Free, unsubscribe anytime.