Avoid having noisy vehicle exhaust

Find out how to avoid excessive vehicle exhaust noise, the legal requirements for exhaust systems, and the penalties and inspection process for vehicles that exceed noise limits.

The EPA maintains a ‘Report noisy vehicles’ service. If someone reports you to the EPA for having a noisy vehicle, you may have to take it to an inspection station to ensure its exhaust noise level, noise control equipment and pollution control equipment comply with legal requirements. In some cases, noisy vehicle owners may have to pay a fine or have their vehicle’s registration suspended.

Penalties also apply for other types of noise from vehicles and smoky vehicles.

Defective exhaust systems and noise control equipment

More noise does not mean more power or make you seem ‘cool’. Instead, it could mean spending a lot of money on repairs or paying a penalty.

If EPA authorised officers are undertaking a campaign and pull over your vehicle with illegal noise control equipment, they may issue a fine on the spot. There is a tiered scale for fines - the louder the exhaust noise, the greater the penalty.

Find out more about fines and penalties.

Causes of excessive noise

Excessive noise is caused by:

• the exhaust system having been replaced with a sports or other loud system to make it ‘roar’
• the baffles having been altered or removed from the muffler
• defective noise control equipment in the exhaust system or engine making gas escape from a place other than the exhaust outlet
• noise control equipment having been fitted or modified to make more noise than the original equipment fitted by the vehicle manufacturer
• noise control equipment such as mufflers and baffles having been removed and not replaced.

It is also an offence to use temporary noise reduction devices or packing in vehicle exhausts, including:

• baffles in the exhaust system that have not been welded or riveted in place
• valves or other adjustable equipment
• materials inserted into the exhaust system, such as steel wool.

However, the following equipment is permitted:

• baffles that were not welded or riveted or an adjustable device in the exhaust system, or a replacement equivalent to that fitted by the manufacturer, when the vehicle was manufactured
• baffles bolted or otherwise securely fastened on a motorcycle.

Prevent noisy exhaust

• Listen to the exhaust system when buying a vehicle. If it sounds noisier than unmodified vehicles of the same make and model, the exhaust system may have been altered. If in doubt, make inquiries.
• Regularly have your exhaust mufflers maintained.
• Do not fit equipment that causes increased exhaust noise.

Legal noise levels

Legal noise levels depend on whether the vehicle is certified according to Australian Design Rule (ADR) 83/00, which came into force progressively from 2005. ADR83/00 noise levels can be found on the federal Department of Infrastructure and Transport's website.

For vehicles certified before ADR 83/00 came into force, Road Transport (Vehicle Registration) Regulation 2017 specifies prescribed noise levels.

This means, for example:

• for a car type vehicle built after 1982, the maximum stationary noise level is 90 decibels
• for car-type vehicles build in or before 1982—96 dB(A)
• for a motor bike or motor trike built after February 1985—94 dB(A), or
• for a motor bike or motor trike built in or before February 1985—100 dB(A).

For vehicles certified since ADR 83/00 came into force, Section 142 of the Road Transport (Vehicle Registration) Regulation state:

The stationary noise level of a motor vehicle that is certified to ADR 83/00 must not exceed, by more than 5 dB(A), the noise level that is established for the motor vehicle when it is certified.

Getting a vehicle inspection notice

If someone has reported your vehicle to the EPA and the EPA believes it is exceeding legal noise levels, you will receive a vehicle inspection notice (VIN). The VIN will instruct you to take the vehicle to an approved station where its noise levels will be tested and its pollution control devices inspected.

It is a good idea to have any faulty equipment repaired before contacting the station to make an appointment. Ensure you visit the station before the ‘compliance due date’ on the VIN, and as soon as possible after receiving the VIN to allow yourself enough time to undertake any further necessary repairs.

EPA approved inspection stations

You can take your vehicle to any EPA approved inspection station, but to avoid problems or delays in processing the mechanic’s report, take your vehicle to the same station for any further inspections.

Getting your vehicle inspected

A mechanic at the inspection station, who the EPA has trained in testing vehicle exhaust noise and identifying and assessing vehicle pollution control devices, will inspect your vehicle.

An exhaust noise test will be conducted according to the National Stationary Exhaust Noise Test Procedures for in-service Motor Vehicles. The mechanic will measure noise levels when the engine is running at a predetermined engine speed (RPM) and when the engine is reduced from the RPM. The vehicle’s exhaust noise level is the maximum average level recorded during the noise test.

The maximum fee for tests or inspections in the 2026–27 financial year:

• car, bus or truck is $96.65
• motorcycle is $64.15

The EPA approved mechanic can answer all your questions about the noise test or vehicle inspection. Otherwise, contact the EPA on 02 9995 5700.

After the inspection, the mechanic will complete an approved report and send it to the EPA and to you. If the vehicle noise levels and the pollution control devices comply with legislation, you will receive a letter stating no further action is necessary.

If your vehicle needs repairs, the report will advise you of the repairs to be completed by the compliance due date on the VIN. You or a mechanic of your choice may repair the vehicle. An EPA approved mechanic does not have to do it. You must then take the vehicle back to the approved station for testing and inspection.

Receiving a defective vehicle notice

You will receive a defective vehicle notice (DVN) if:

• the mechanic’s report indicated you needed to repair your vehicle by the compliance due date on the VIN, and this date has lapsed
• you ignored the VIN or did not take the vehicle to the approved station by the compliance due date.

A DVN may require you to:

• reduce the vehicle’s exhaust noise levels to within the legal limits
• rectify any defective noise control equipment
• refit, reconnect or repair any prescribed anti-pollution devices or any device to minimise air pollution.

You can repair the vehicle yourself or select a mechanic to repair it. An EPA approved mechanic does not have to repair it.

Once repairs are completed, you must take your vehicle to the EPA approved station for testing and inspection by the compliance due date on the DVN.

When your vehicle is unavailable or you do not have documentation

Email the EPA at [email protected] or phone 02 9995 5700 if:

• your vehicle has been sold, stolen, in an accident or taken temporarily or permanently off the road before ​the compliance due date in the VIN or DVN
• you have not received or have lost the VIN or DVN: the EPA will send a copy which you must take to the approved inspection station when you present the vehicle for testing and inspection

Suspension of vehicle registration

The EPA may suspend your vehicle’s registration if:

• you failed to present your vehicle for inspection by the compliance due date on the DVN
• any subsequent defects were not rectified by the compliance due date on the DVN and the motor vehicle was in such a condition that its sale or use would constitute an offence.

If the registration is suspended, you cannot use the vehicle on a road or road-related area, except to take it to:

• be tested and or inspected in accordance with the requirements of the DVN
• have repairs or other work carried out to comply with the DVN
• return the vehicle from such a place to the place where the vehicle is usually kept.

If your registration is suspended and you then repair the vehicle, take it to an approved station for testing and inspection. Give the DVN to the mechanic as it will contain details of the required repairs. The mechanic will inform the EPA if the defects have been rectified. The EPA will then clear the DVN and lift the suspension of registration.