I've been looking around on the net and seen some custom installs from fastheadlights.com and plainansimple.com and their instagram posts. I haven't seen anyone on here that did the retrofit on the 2014 sierra but I've seen plenty on the silverados. From my own experience with the oem projector with 5000 35w hid, they suck. On a dark road they light up the road decently but recently I took a trip to houston with the city lights on the interstate I could barely see anything. I also tried the 55w 5000k and show a little better but emits alot of heat. I guess what I'm getting at.. is it worth doing the retrofit, has it been done successfully on the sierra's, and who's a reputable company to deal with?