Q: I want the halo look, and i like the external look but i'm just curious if i have to install hid system with the projector headlamps or can i use the same set up i got now
A: The headlight assembly that you get from ebay or performance shops often times use the bulbs from fog lamps, most often the H3. I had one installed and I didn't have to change anything. It's simply bolt on and connect. Unless you want the real HID system, then you have to buy the bulb and the ballast for the bulbs. The few more work but they really look cool and high end.