Wisconsin Statutes & Annotations
Chapter 347 - Equipment of vehicles.
347.39 - Mufflers.

347.39 Mufflers.
(1) No person shall operate on a highway any motor vehicle subject to registration unless such motor vehicle is equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise or annoying smoke. This subsection also applies to motor bicycles.
(2) No muffler or exhaust system on any vehicle mentioned in sub. (1) shall be equipped with a cutout, bypass or similar device nor shall there be installed in the exhaust system of any such vehicle any device to ignite exhaust gases so as to produce flame within or without the exhaust system. No person shall modify the exhaust system of any such motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all the requirements of this section.
(3) In this section, “muffler" means a device consisting of a series of chambers of baffle plates or other mechanical design for receiving exhaust gases from an internal combustion engine and which is effective in reducing noise.
History: 1983 a. 243.

Structure Wisconsin Statutes & Annotations

Wisconsin Statutes & Annotations

Chapter 347 - Equipment of vehicles.

347.01 - Words and phrases defined.

347.02 - Applicability of chapter.

347.03 - Sale of prohibited equipment unlawful.

347.04 - Owner responsible for improperly equipped vehicle.

347.05 - Reciprocity agreements as to equipment.

347.06 - When lighted lamps required.

347.07 - Special restrictions on lamps and the use thereof.

347.08 - Determining the visibility distance and mounted height of lamps.

347.09 - Headlamps on motor vehicles.

347.10 - Headlamp specifications for motor vehicles other than mopeds and motor bicycles.

347.11 - Headlamp specifications for mopeds and motor bicycles.

347.115 - Modulating headlamps for motorcycles, motor bicycles or mopeds.

347.12 - Use of multiple-beam headlamps.

347.13 - Tail lamps and registration plate lamps.

347.14 - Stop lamps.

347.145 - Deceleration warning lights for motorcycles, motor bicycles, mopeds or motor buses.

347.15 - Direction signal lamps or devices.

347.16 - Clearance lamps and reflectors.

347.17 - Color of clearance and marker lamps and reflectors.

347.18 - Mounting of clearance lamps and reflectors.

347.19 - Visibility of clearance lamps and reflectors.

347.20 - Lamp or flag on projecting load or fixture.

347.21 - Lamps and flags on trains of agricultural vehicles.

347.22 - Lamps on farm tractors, self-propelled implements of husbandry, and lightweight utility vehicles.

347.23 - Lamps on highway maintenance equipment.

347.24 - Lamps and reflectors on nonmotor vehicles and equipment.

347.245 - Identification emblem on certain slow moving vehicles.

347.25 - Special warning lamps on vehicles.

347.26 - Restrictions on certain optional lighting equipment.

347.27 - When lighted lamps required on parked vehicles.

347.28 - Certain vehicles to carry flares or other warning devices.

347.29 - Display of warning devices for certain vehicles when standing on highway.

347.30 - Penalty for violating lighting equipment requirements.

347.35 - Brakes.

347.36 - Performance ability of brakes.

347.37 - Brake fluid, sale regulation.

347.38 - Horns and warning devices.

347.385 - Auxiliary lamps on emergency vehicles; traffic control signal emergency preemption devices.

347.39 - Mufflers.

347.40 - Mirrors.

347.41 - Speed indicators.

347.413 - Ignition interlock device tampering; failure to install.

347.415 - Odometer tampering.

347.417 - Immobilization device tampering.

347.42 - Windshield wipers.

347.43 - Safety glass.

347.435 - Vehicle monitoring and feedback.

347.44 - Painting requirements for school buses; restrictions as to painting of other vehicles.

347.445 - Crossing gates for school buses.

347.447 - Additional safety mirrors on school buses.

347.45 - Tire equipment.

347.455 - Modifications to height of vehicle.

347.46 - Fenders and mudguards.

347.47 - Drawbars, trailer hitches and mobile home couplings.

347.475 - Airbags, prohibited practices.

347.48 - Safety belts and child safety restraint systems.

347.485 - Protective headgear for use on motorcycles.

347.486 - General requirements.

347.487 - Seating requirements.

347.488 - Moped equipment.

347.489 - Lamps and other equipment on bicycles and other vehicles and devices.

347.49 - Equipment of vehicles transporting flammable liquids.

347.50 - Penalties.