Blerb from LTSA: HID conversion kits (an HID bulb with a high voltage power unit or ‘ballast’ which fits into the original headlamp unit in place of the original bulb with no change to the headlamp lens, reflector or housing) are illegal on any vehicle being used on New Zealand roads.
However, a complete halogen headlamp unit can be replaced with a complete HID headlamp unit provided that the replacement headlamp unit complies with approved standards. If in doubt, get advice from a vehicle lighting retailer you trust.
Ok i want HID's on the MR2. Reading the part in blue, this is only legal if i change the whole light housing. Questions are, who sells these in nz, i would assume they were not to hard to obtain as the mr2 light would be a fairly standard size, and do HID's come in a high/low beam setup at all?