Ben916 & I installed his unit (Sawyers) about two weeks ago, then I did mine the next day. Ben's had the stock radio, I had previously had a RNS-E installed. I had previously installed a RNS-E about 5 years ago and a couple of years ago installed the factory Bluetooth, when doing the Bluetooth I also swapped the Onstar GPS antenna over to the RNS-E and removed the previous installed Magnetic antenna. Ben's was a little more work as we had to pull the Onstar and accidentally started by plugging the Onstar Cell antenna in instead of the GPS antenna. Zawa (Adam) kit was very nicely packaged and had everything you need. Compared with finding a cheap old unit in good shape it's a pretty good deal.