9004 is a dual filament bulb. It has a low beam and high beam built into the same bulb. When choosing your HID kit you will need to determine if you want HID lights on just your low beam or on your low beams and high beams. If you elect to for both than you will need to upgrade to the Bi-Xenon HID Kit. Included in your purchase of this HID Kit is a pair of premium ballasts and a pair of premium Xenon HID bulbs along with necessary installation accessories.
Shop for 9004 hid kit Automotive at hidnation.com. 9004 hid kit are available in golden yellow, pure white, bright white, ice blue and deep blue color.
9004 HID Conversion Kit Installation Manuals:
9004 HID Conversion Kit
9004 HID Conversion Kit (with Relay)
9004 HID Conversion Kit (with Cancellers)
9004 HID Conversion Kit (With Relay + Canceller Combo)