Just a suggestion. It would be fantastic if ppl who post can support these with guidelines / legislation, especially the roadworthiness related ones (eg the pod filter / suspension height)...

For window tinting: VSI03
http://www.rta.nsw.gov.au/registrati...vsi03_rev3.pdf

For wheel and tyres: VSI09
http://www.rta.nsw.gov.au/registrati...vsi09_rev4.pdf

VSI15 engineering signatories
http://www.rta.nsw.gov.au/registrati.../vsi/vsi15.pdf

Here's a general link for the National Code of Practice for Light Vehicle Construction and Modification (NCOP)
http://www.dotars.gov.au/transport/s.../vsb_ncop.aspx