After seeing a few people on here do the conversion I bit the bullet and ordered my used 8.4 yesterday from LKQ. I had seen one show up at the location to me in Birmingham, but it had already been sold by the time I got there. They had one in Maine and I went ahead and told them to start sending it this way! This one does have the nav and Sirius xm. To those that have done the swap, how tough is the antenna to install to get the nav capabilities?