With my car, and bare in mind I'm from Victoria, I have to meet vsb14 but not ADR as such nor emissions regs as its a 62, just general safety requirements, so retractable seat belts, dual speed wipers and all of that stuff.
Here's one of my first emails from my engineer
The project is feasible with the proposed engine configuration. There would need to be a detailed review conducted of all the modifications and the registration requirements applicable. There are no emission requirements applicable, ie. not cat required, however you would be required to conform with the safety upgrade requirements applicable to a power increase > 20%.
Refer to VicRoads VSI8 & NCOP VSB14 for regulations relating to modifications.
http://www.infrastructure.gov.au/roads/ ... _ncop.aspx
As I said I'm not sure about nsw but if that helps then all good, best way to go is to contact an engineer because they are going to be the ones signing off on it. Don't start a build without talking to one.
Cheers
Sean