I know that some years ago the answer was a resounding no - you could go run a 10 second pass with a super ropey half-cage made of exhaust off-cuts arc-welded together in your mates garage and that was more or less fine, but MSNZ would laugh at you if you tried to get the cage homologated.
@sobanoodle BuT NZDM yO!
I still rate my DIY option really, 40 odd dollars for a flange, some steel tube off cuts and a few spare hours and it probably performs just as well as an overpriced Subtech pipe