It was a little hard for the wiring, i cut a little hole in the roof and brought the wires through there. Instead of taking the headliner out i took the center light out on the inside of the car and then just fished them to the switch in the driver side headliner. From there I fished it under the headliner to the A piller and just brought it down through the fire wall, used an in-line fuse and just connected it to the battery. I then filled the holes with a ton of silicon sealant so it wouldn't leak. Haha and yes they are crazy bright it was a little startling at first, they are advertised as adding an extra 1/4 mile of distance.