Peter, I believe this situation/topic has been discussed more than any other topic on the forum. At least recently that certainly would be true. There is not a simple single answer. There are many pieces of information, myth, different opinions, and options. The best and easiest option to purchase a programmed SKREEM is on hold right now until Chrysler and Mercedes sort things out. I highly recommend you use the search feature for "SKREEM" to get to an abundance of information. That's better than everyone duplicating what has been said over and over.