Don't know if anyone else has picked up on this yet...and I imagine it's a similar story for other states.
Having a read through the NCOP while searching for some info, and found that it's now a lot harder for us to legally modify our cars. For instance, any modification of engine/engine components that increases power by more than 20% and/or affects exhaust emissions now requires certification.
From Light vehicle modifications (Department of Transport and Main Roads) :
...
National Code of Practice for Light Vehicle Construction and Modification
From 1 November 2012, the use of the National Code of Practice for Light Vehicle Construction and Modification (the NCOP) will commence in Queensland. Vehicle owners wishing to modify their vehicles under the NCOP are encouraged to consult with an Approved Person who is able to certify the modifications.
...
Code of Practice: Light Vehicle Modifications
This code of practice has operated in Queensland since the early 1990s and was one of the first codes of practice for light vehicle modifications in Australia. Due to the introduction of the NCOP from 1 November 2012, the Code of Practice – Light Vehicle Modifications will be progressively phased out.
To ensure a smooth move to the NCOP, the department has allowed for a 6 month transition period. This means that until 30 April 2013, modifications to light vehicles that had commenced before the NCOP was introduced, can still be certified under the existing Code of Practice: Light Motor Vehicles.
See Vehicle Standards Bulletin 14 (VSB 14) for the NCOP in full.