Sturt cop shop does not offer this facility anymore and you have to go to the regency inspection centre at regency park.
It is a place arounf the corner from where they do the defects, and they will go over your car pretty well checking for leaks and the like.
If you have anything obviously defectablre you will not be able to get through, they are cracking down on this type of thing pretty heavily.
I had top take my 34 through there in november last year and got through fine with just an exhaust.
They questioned my window tint, but it is actually privacy glass, so they had to let me go.
It can be pretty nerve racking though.