I have a 2013 P85 that is not under warranty. I had to replace the MCU screen and want to do the plug and play upgrade while it is out because 3g will be obsolete by 2022. I live in Southern California and called the Agoura Hills parts department to see if they had one in stock. He tried to tell me that I cannot buy one without them installing it because it needed to be programmed. From what I have seen and read, that is not true. Why should I have to put my car back together and bring it into Tesla for them to charge me labor for a plug and play install? Again, that part of my car is not under warranty. I have called and sent multiple e mails to Tesla and have had no response. Does anybody have any advice on how to get them to listen? This is also allowing dealers to price gouge on used LTE modems.