[MrBlonde]

I've been through the process and legally registered my M Coupe with all modifications.

You have to find an automotive engineer that is approved by RMS (there is a small list). Then you present your vehicle to them and they assess and will write up a report if they agree everything is acceptable. Along the way you may need to change a few things until the engineer is in agreement.

Armed with the engineer's report you then must get a Blue Slip from an authorised RMS workshop. You take the engineer's report and the Blue Slip place inspects your vehicle.

Armed with Blue Slip and Engineer's report you go to RMS and have your rego papers amended. There is a special code put on your rego including the engineer's report document number.

In the old days when you had an actual rego sticker there was a special code on there so Mr Highway Patrol could see you'd been through the process legally. You can keep a copy of the engineer's report in your vehicle (I always do).

None of this stops a highway patrol vehicle from pulling you over for an RBT or for some other reason they deem correct and issuing you with a defect notice.

The responsibility is then yours to pass a pit inspection. No car ever does.