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You can add the halogen head lights. With a retro fit. #1 you'll have to mod the stock ballast wiring to adapt to the new 9006 HID bulb. #2 the auto leveling light will be on in the speedometer. #3 Remove the bulb I can't remember if I did. I sold my GS4 last year. Also don't get the OEM massive ebay they suck. Lastly please adjust your headlights correctly you'll be getting flashed constantly.