Yes.
N
yes is legal
no
Aftermarket HID's are illegal in ANY state. Period.
Yes.
Depends, HID KITS are not legal anywhere in the US, they violate US DOT law. HID lights that come factory with a proper projector designed with HID in mind (higher end cars; Audi, Mercedes). Practically, if you aim the HID lights down, as to not blind other drivers, its unlikely that a cop will pull you over, as they can't really tell if your lights stock or an addon kit.
HID headlamps designed, engineered, manufactured, and certified or type-approved as HID headlamps are legal everywhere. "HID kits" and "projector retrofits", where HID bulbs are installed in headlamps not originally designed to accept them, are unsafe and illegal everywhere.
No, there are no such things as "hid lights".
The older BMWs do not have HID lights
No, generaly the car lights cums with elargins if we want HID lights we can install...it
Don't. "HID kits" are widely available, but they are (all) illegal and dangerous. The only legitimate/safe/legal HID conversion is to install complete HID headlamp assemblies designed, built, tested, and certified as such. Halogen headlamps mustuse halogen bulbs.