http://www.dpi.wa.gov.au/mediaFiles/...rm_prodveh.pdf
Fill that out and mail it in, you'll receive a reply about a fortnight later listing what will and wont pass and what requires an engineers stamp of approval. Doing the application and sitting down with an engineer is the best way of tackling the tech department. I did with the wagon a few years ago and had suspension, exhaust, wastegate
bov (?), gauges, dogbox, raceseat etc all covered. Worth the effort if your 'serious' about it.