I had installed a dynavin unit in my recently sold e39 wagon. It had great support over on that forum. Decided to go see if they had any options for the e8x cars and to my surprise they do. Check this out...
https://www.jandtdistributing.com/co...nt=44130206221
Looks to be a nice unit and I'm certainly considering purchasing. Price as shown is $699. I was very pleased with unit I installed in the e39, so no hesitation buying this one...