The Crossfire has high beam and low beam in separate bulbs, if you install HID, you either install in high or low, or in both (2 hid kits). What happens in cars that have high and low beams in the same bulb, is that when you install HID, you lose your high beam which doesn't happen in the Crossfire.
So by saying you don't have a low beam and just high beam, I guess you mean that your low beam is so high that is looks like a high beam and everybody blinks their lights at you. As I said before, the thing to do is aiming your lights the proper way. It is stated in the user's manual, if you can't find it you can search in the forums, I remember some posts about it with helpful links like this one: http://www.advanceautoparts.com/engl...0010801ha.html.
You can also do a search online.