Before I bought my 840 in 2004, I had never seen one until one day I stumbled across a website built by a German guy.
http://www.e31.net/index.html
It is all about the E31 and in particular his 850 CSI. He had taken video of driving down the Autobahn on the last day before speed restrictions were introduced - and he achieved around 300KMP - it just blew me away. The video of him driving it around bends in the German countryside, standing starts and braking were also brilliant. I was hooked and it is because of this website that I knew I had to own one.
I note the website has not been updated since 2009.
Does anyone know who he is, is he a member here? I owe him a debt of gratitude!!