You can register on this site: Kia Global Information System (KGIS)
Once you can log in, then you should go to:
Service materials, then Service info, and put Model Year, and Engine.
Then click on replace, and on Audio unit.
Last on Removal and you are!
There you have all the instructions needed with pics.
I made my own tool from a coat hanger referencing the pic in this thread. I stick it into the air vents and the hooks get caught between where the plastic ends and the metal begins. I pull on it pretty hard and it doesn't budge. From the instructions on the kia tech site it seems like there aren't any clips holding the vents in place so I don't understand what's holding it in place. If there is anyone who has done this before can you try to describe how much force you had to use and if I'm hooking it on the right spot.