Ownership & Law
Is Car Tuning Legal in Victoria? What Owners Should Know
· 3 min read · PTEB Tuning
Tuning a car isn't illegal in itself, but modified road cars in Victoria must still meet roadworthiness, design, emissions and noise requirements. This guide covers the general picture and the official places to check. It isn't legal advice — for your specific car, talk to a certified engineer.
What "legal" means for a modified car
For a road car, "legal" really means three things: the vehicle stays roadworthy, it still complies with the design rules that apply to it, and its modifications are within what VicRoads allows — with certification where required.
A car can be perfectly safe and still be non-compliant if a modification that needs certification hasn't been certified.
The key reference: VicRoads VSI 8
VicRoads publishes Vehicle Standards Information guides, and VSI 8 is its guide to modifications for motor vehicles. It sets out which modifications are acceptable without approval, and which need to be assessed and certified for the vehicle to stay registered.
Rules and thresholds can change, so always read the current version on the VicRoads website rather than relying on forum advice or old articles.
When certification may be needed
Larger changes to an engine's performance — such as significant power increases, engine changes or major forced-induction upgrades — may need assessment by a Vehicle Assessment Signatory Scheme (VASS) signatory. VASS signatories are engineers approved to inspect and certify modified vehicles in Victoria.
The best time to talk to a VASS engineer is before you build. They can tell you exactly what will need certification and what's required, so you don't buy parts that create problems later.
Emissions
Modified vehicles must continue to meet the emissions requirements that apply to them. Removing, disabling or tampering with emissions equipment — catalytic converters, diesel particulate filters, EGR systems — on a road vehicle can make it non-compliant and may be an offence.
Noise
Exhaust noise is regulated too. A modified exhaust that's excessively loud can attract a defect notice or an EPA Victoria noise-testing requirement. Choose exhaust parts with road use in mind.
Defects and roadworthy certificates
Police and authorised officers can issue defect notices for vehicles they believe are unroadworthy or non-compliant. A roadworthy certificate is also needed in situations such as selling a registered vehicle in Victoria — another reason to keep modifications compliant and documented.
Tell your insurer
Most insurers require you to declare modifications, including ECU tunes. Failing to disclose them can put a claim at risk. Read your policy, declare the tune, and keep the paperwork your tuner gives you.
A practical checklist
- Read the current VicRoads VSI 8 guide.
- Talk to a VASS signatory before major modifications.
- Keep emissions equipment in place on road cars.
- Choose exhausts that meet noise requirements.
- Declare modifications to your insurer.
- Keep records of every modification and calibration.
How PTEB approaches it
We'll always tell you honestly what a build involves. For road-registered builds beyond Stage 2, we recommend consulting a licensed vehicle engineer before work starts.