NSW
Like Victoria, vehicles registered in NSW can now be lifted up to 75mm with a maximum of 50mm diameter (25mm lift) and 50mm from suspension.
Section 3.1 of the following:
http://www.rms.nsw.gov.au/documents/...ide-height.pdf
https://thelapyear.com/state-by-stat...es-suspension/
Engineering is very expensive and time consuming. Usually involves a lane change test at a track.
Remember, the max lift in NSW of 75mm includes any lift that your tyres give you. So if you add 50mm diameter to your tyres, your going to add 25mm lift to your vehicle, which allows a legal 50mm lift to be added.
In WA, im pretty sure we still have the 50mm total lift law. Thats why i always keep a spare set of wheels/tyres and suspension in my garage.
Cheers,