X5FX, just called Dinan again. The Dinan tech reiterated what I was told couple of weeks ago. The Stage 2 tune is NOT available for the 2013 X5 35i. They have not tested it on the 2013 X5s 35i yet. He said you can try to download the software on a 2013 X5 35i, but Dinan can't guarantee it will work properly.