Car Mods in Australia: How to Modify Your Car Without Breaking the Law
Modifying your car is a fun way to upgrade your car in whatever style you want (appearance-wise), and you might think there’s no negative impact of car modifications. But little do you know, there is an impact to it, and you can even get fined or jailed if your car modification includes an illegal upgrade.
That’s why it’s crucial to understand what car modifications do and which ones are illegal. But you shouldn’t rely solely on hearsay. As a beginner, you need advice based on the basis of automotive performance, like that from Mars Performance. Having the right information about car modifications can help you avoid legal consequences and ensure your car remains road-legal.
We’re here to help by creating a car modification guide for every beginner and even car enthusiasts who badly want to modify their cars and need guidance. And since we live in a technological world, we’re laying it all out for you because you have the means and power to learn about your rights when it comes to car modifications.
What is Car Modification?
Car modification is also known as car tuning; it refers to the process of altering or enhancing the specifications and features of a vehicle from its original manufacturer settings. You can do all sorts of modifications to your car such as changing the engine, suspension, bodywork, and interior to improve performance, appearance, or functionality of your car.
How Does Car Modification Works
Car modification works by making alterations to a vehicle's components. This can include installing aftermarket parts, tuning the engine, upgrading the suspension system, or adding custom paint jobs and decals.
Furthermore, these modifications can range from simple cosmetic tweaks to complex mechanical upgrades. The most common ones include louder exhausts, tinted windows, neon lights, and enhanced sound systems.
Every car enthusiast loves adding modifications to their car since it is a great way to add personality and truly make it their own! Moreover, these changes help achieve better performance—sometimes even beyond the car’s limits.
Types of Car Modifications
Let’s dive deeper into the world of the automotive industry and examine the specific types of car modifications and how they can uniquely transform your vehicle.
1. Aesthetic Modifications
Upgrading your car’s exterior and interior is all part of cosmetic enhancements. Aligning its style with your personal preference allows you to show it off while improving its overall appearance. In some cases, aesthetic upgrades can also increase resale value.
Common enhancements:
- New paint jobs
- Vinyl wraps
- Custom lighting
- Body kits and spoilers
- Steering wheels
2. Interior Modification
Upgrading your car’s interior enhances comfort, style, and functionality. Especially when you’re out on the road driving along the coastline, while blasting some music while the fresh air hits your face—a well-designed interior adds to the driving experience.
Common Enhancements:
- Upgraded sound systems
- Comfortable seats
- Ambient lighting
3. Performance Modifications
Performance modifications take your car into another level. These upgrades can enhance acceleration, handling, and fuel efficiency in boosting your car’s power.
Common Enhancements:
- Engine tuning
- Turbochargers & Superchargers
- Exhaust system
- Cold air intakes
- Fuel injectors & Fuel Pumps
4. Suspension Modifications
Suspension upgrades are the way to go if you want to enhance the stability, ride comfort, and handling of your car. Whether lowering your car for aesthetics or adjusting suspension for off-road performance, these modifications play a crucial role in how your vehicle handles different terrains.
Common Enhancements:
- Lowering kits
- CoiloversAir suspension
- Shocks & Struts
- Sway bars
5. Wheel & Tire Modifications
There’s also the choice of modifying your wheels and tires as it can drastically change your car’s handling and grip. When you choose the right set, it will surely improve performance, fuel efficiency, and aesthetics of your vehicle.
Common Enhancements:
- Custom Wheels
- Aftermarket Rims
- Alloy Wheels
- Chrome Wheels
- Performance Wheels
Car Modification Laws Australia
Now that we know the different types of modifications you can do to your car, we are down to identifying the laws regarding car modification in Australia.
In Australia, national standards regulate road vehicle safety, anti-theft measures, and emissions. These standards are known as the Australian Design Rules (ADRs). All new road vehicles manufactured in Australia, as well as imported new or second-hand vehicles, must comply with the relevant ADRs when they are first supplied to the Australian market.
In 2025, Australia began implementing the New Vehicle Efficiency Standard Act 2024 (NVES Act), which aims to reduce fuel consumption and CO₂ emissions in new cars sold across the country.
Under this law, every car manufacturer must meet specific CO₂ targets by offering a mix of fuel-efficient, low-emission, or zero-emission vehicles. The goal is to improve vehicle efficiency, lower fuel costs, and increase vehicle variety—benefiting drivers, especially in regional areas.
Additionally, the ADRs also led the safety and emission standards for vehicles in each state. Now, let's explore these state-specific regulations. There are some rules you've got to play by to keep your modifications safe and legal:
1. New South Wales (NSW) - Car modifications are regulated by the Roads and Maritime Services (RMS) and modifications need to be certified by a licensed engineer. Engine modifications, exhaust systems, suspension changes, and wheel alterations must comply with specific requirements and needs to be checked.
2. Victoria (VIC) - In Victoria, the suspension and braking system modifications must be approved by Vehicle Assessment Signatory Scheme (VASS) Approval Certificate to ensure compliance with safety standards.
Additionally, modifications to use alternative fuel systems must meet safety regulations and require certification from the Alternative Fuel Systems Assessment and Certification Scheme (AFSACS) under an agreement with the Department of Transport and Planning.
3. Western Australia (WA) - Engine modifications, exhaust systems, suspension changes, and wheel and tyre alterations must meet specific requirements. In Western Australia, modifications and inspections are classified into different categories.
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- Minor modifications require no inspection if they comply with applicable legislation.
- Simple modifications require an inspection but do not need written pre-approval from the Department of Transport (DoT). They can be assessed by an Authorised Inspection Station (AIS) vehicle examiner during the inspection.
- Complex modifications require approval, and applicants must complete an online application unless the modification has been gazetted as not requiring formal approval or can be assessed by an Approved Inspection Station (AIS).
4. Queensland (QLD) - the Department of Transport and Main Roads (TMR) manages car modification regulations, including vehicle height, steering modifications, and safety equipment changes, which must comply with specific guidelines.
Furthermore, If you plan to purchase a modified vehicle, you must check your eligibility to drive it. Just like Western Australia, they have car modification category as well:
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- Minor modifications – As long as they meet all applicable vehicle standards, modifications such as towbars and roof racks do not require approval from TMR or an approved person.
- Basic modifications – These must comply with the Queensland Road Vehicle Modification Handbook (PDF, 385KB) and include shock absorber substitutions and power steering conversions. However, if the vehicle continues to meet applicable standards, these modifications do not require approval or certification by an approved person.
- Complex modifications – These are significant modifications that can impact vehicle safety if not performed correctly. They require a thorough inspection and include engine upgrades, suspension upgrades, mass re-rating, gearbox changes, body modifications, and steering and brake replacements.
5. South Australia (SA) - In South Australia, lighting, window tinting, vehicle height adjustments, and performance modifications must comply with specific regulations set by the South Australian Department for Infrastructure and Transport. Key areas include structural changes, vehicle types, seats and restraints, lights and visibility, and compliance testing, all of which must meet safety standards.
6. Tasmania (TAS) - Modifying a car in Tasmania requires certification by a qualified engineer to comply with local legislation. Under the Vehicle and Traffic (Vehicle Standards) Regulations, modified vehicles must adhere to VSB14 or be accepted by the Registrar of Motor Vehicles. Additionally, the Vehicle and Traffic (Driver Licensing and Vehicle Registration) Regulations mandate formal certification of all modifications for public road use.
7. Northern Territory (NT) - In the Northern Territory, if cars meet safety standards and are approved by the Motor Vehicle Registry (MVR) they can be registered. Certain modifications, including repairs or welding, may need engineering certification from a recognized NT engineer.
8. Australian Capital Territory (ACT) - In the ACT, car modification laws are regulated by Access Canberra. Modifications such as engine swaps, exhaust systems, and other changes have specific requirements to ensure that the vehicle complies with safety and environmental standards. Additionally, modified vehicles may need to undergo inspection and be approved by Access Canberra to be legally driven on public roads.
Penalties for Illegal Modifications
Are car modifications illegal? Yes they could be if you don’t follow the regulations. Understanding and adhering to car modification laws in Australia is essential to ensure road safety and legal compliance, which is why they’re put there in the first place. Engaging in illegal car modifications can result in several consequences:
- Defect Notices: If a vehicle is found non-compliant, authorities may issue a defect notice requiring the owner to fix the issue within a set timeframe.
- Fines: Vehicle owners can be fined for having illegal modifications.
- Vehicle Defects: Authorities may issue defect notices, requiring owners to revert changes.
- Insurance Issues: Insurance policies may be voided if the vehicle is found to have illegal modifications.
- Safety Risks: Illegal modifications can compromise the safety and integrity of the vehicle.
- Loss of Registration: In severe cases, the worst case scenario is when the vehicle’s registration may be suspended or canceled until it complies with legal requirements.
Each state and territory has its own set of regulations, and as a car owner, enthusiast, or lover, it is your responsibility to research and comply with the specific requirements for your location. It is also your duty to be a responsible driver.
In this guide, Mars Performance provides real-time information about the road and your car. We understand the importance of modifying your car, as it can be enjoyable and a great way to enhance your car’s performance, appearance, and individuality. However, it’s crucial to do so responsibly, keeping safety, legality, and quality in mind.
If you’re looking for new accessories or car modifications, remember to check out Mars Performance for expert advice and a wide range of products and services tailored to your car modification needs.
The aftermarket accessories provided by Mars Performance are durable, high-quality, and reliable on the road. We adhere to all rules and regulations, understanding the risks associated with any modification.
Car modification can be a rewarding hobby, but it’s essential to stay within legal boundaries to avoid complications.
Remember to drive responsibly!
