I linked the halos into the turn signals/running lights. (You can run a new wire for power if it bothers you) I recommend soldering and heat shrink, if you don’t know how ask a mechanically inclined friend or pay to have it done. The halos blink with the signal which I find to be just fine.There is a lower bracket for the original lights that needs to be removed before these can be installed.Also the light required a slight modification with one of the posts (plastic, i snapped off the tip and it worked)But overall very happy with the look and function03 325i does not have separate wiring for the DRL (Daytime running lights) so your headlight switch functions as the DRL just like stock. Which I also find to be just fine.