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Nope, not all cars that have projectors come with stock HIDS... My 300ZX for example also had projectors but just regular bulbs, our cars are another example. You can't really tell if a car has HIDs or not unless the lights are on, unless the headlights are reflectors and you can see the bulb itself. An HID bulb is a long bulb with a extra rod going down one of the sides I guess you could call it...
HID bulb: D2R bulb...
Standard Bulb: 9006 bulb...