I'm in the process of getting my GTR registered from NSW to ACT-3rd time lucky-no! The second set of wheels they have picked up again a tiny crack in the rim-fix that & I'm through(hopefully)
things that were a problem:
1. clearance with exhaust-modified for height but still too low(its 100mm min with 4 people in it!)-suspension has been raised so it passed that but looks like a 4wd jacked up.
2. Child restraints-need these and the parcel shelf
3. sealed battery in boot (33) that says "sealed battery"
4. exhaust too loud-I changed the rear muffler to a quite one-passed the DB test
5. wheels-have to be as per door plague-my 18x10 were no good-3 of Jays 17x9 have passed with #4's hairline crack being repaired.
6. Things that passed: HKS airfilters, BOV (although factory), altered suspension aprt from height
My experience was that it had to go through Dickson to get the ID check anyway and in the words of the inspectors "there are always tough on these sorts of cars"!
Good luck