In Australia, mods are legal if they comply with the Australian Design Rules (ADRs) and your state’s regulations; attitude doesn’t make a car illegal, but unsafe does. Small changes are usually fine: wheels and tyres that fit under the guards, quality suspension that doesn’t leave it on the bump stops, ADR‑compliant lighting, and properly rated tow bars. What’s not fine: removing emissions gear, exhausts that could wake Wagga, tyres poking past guards, sharp edges, and any fiddling with airbags or ESC. Big-ticket changes typically need engineering sign‑off and inspection (often a mod plate or report): engine swaps or turbo/supercharger conversions, major brake upgrades, significant ride‑height changes, seat/seatbelt alterations, steering or chassis modifications. Paperwork and thresholds vary by state—think VicRoads, TfNSW, TMR QLD, DIT SA, DOT WA—so read their guidance, keep receipts, and carry the certificate with the car. Bottom line: build it safe and compliant, and you’ll enjoy the noise without donating your rego to the shredder.
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