My insurance policy states that they will only insure my vehicle if I have a black wire alarm installed - period.
Also, some crap about no being insured if I park it on the street within 500m of my house.
Theft excess is
Until recently I have never been pulled over by the cops, until Knox TMU caught sight of me on the roadside, but that was nearly 12 months after I bought it.
If you live/drive near Knox driving an import could be a hassle for this reason, but at your age, I can't imagine too much hassles from the boys in blue.
Insurance I would imagine might be less than $1000 for you with a fairly stock R33, but depends on company.
The killer with insurance is theft excess. My std excess is about $450 + "import excess" of $700, so any crash is $1,150.
If it's stolen, then it's another $700 bucks, so that's $1,850. Owwwch!