I think some of the low/hi kits have the HID for LOW and the halogen for HI.
The relay is a safety net, it portects the circuts from having issue and helps make sure the bulbs dont blow out, the fuse in the harness will go first.
Your DRL's (day time running lights) will stay on all the time, unless you de-activate them. Which I recommend to help the bulbs and ballasts last longer. During the day the DRL run on less power then at night and can damage the ballasts and bulbs.
I am not sure how to take away the DRL on the 04+ models, but i think there is a way.
