Hi I imported my 1981 MK1 Golf GTI and my Corrado VR6 Storm from the UK when we emigrated at the end of 2007 so may be able to help?
First thing is they have to be pre 89 models to get around the 15 year rule. Otherwise you have to bring it in as a 'personal import' but to do this you have to have owned and used the vehicle abroad for a year before you can import it. They are very strict about this and require evidence of you being out of Oz for that year and proof of vehicle use abroad. You might be able to get an official grey importer to do if for you to get around this but I dont know about the rules on that.
My Golf is modified with a T3 turbo technics kit fitted, a BRM 2.0L engine and full aftermarket electronic injection and ignition with mapped boost. Believe me the DTEI were not having any of it when they saw it first time for its compliance testsing and wanted it all removed. Eventually I had a full engineers report done and got her through but was very very lucky and patient with the DTEI. The only mod I had to do to the motor was remove the atmospheric dump valve and fit a recirculating one instead.
Other than this, the mods I had to do that would apply to your cars were fabricating and fitting rear child seat restraint anchor points, fabricating and fitting side impact door bars as the Oz version at that time had them as standard and fitting of a high level brake light (no one was sure if it needed this so I did it anyway).
Hope this helps?
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