Good mountains???? flat mate Nar we do have some hills inland, not really that many good roads and cops are there.
If ya car looks like balls it will get pulled over, but generally we have it much better than over east. No yearly inspections, just pay your rego (ctp) and you are set. If you do get a yellow sticker (defective notice), it can be removed depending on how much of a list they write up. Probably will be for too low, too much track, and maybe a general item or two. Obviously with major conversions you probs need an engineers cert.
MC motorsport wont let you drift. However they tolerate oversteer, no entries though. Barbs and collie (2.5hrs south of perth) are your main tracks. A drift practise held monthly on a friday night at barbs. Collie has the occasional drift assault (check out driftwa.com.au), and burnout and drift comp. Barbs suits bigger hp cars, collie is a little more forgiving for the 4a's.