I bought my GTT from Vic... we have "authorised inspection stations" here which are just workshops/servos, but if your car is too modified you will have to go to the main inspection place at Dickson (aka "the pits"). It's a proper inspection place with rollers, noise level equipment etc.
The rules seem to be a bit better here than some states (we can have un-enclosed pods etc) but it's a bit hit and miss. If your car is tidy you may get away with more than if you are trying to pass something that looks like a drift pig.
What sort of mods are we talking about?