Hello,
While I do not own an Alpina, I have had the pleasure of driving AlpinaMan's cars (B7 Turbo, B10 and B11).
Congratulations on launching this new site and I look forward in participating in the discussions and sharing information.
I currently own a NA spec e28 M5 that's been somewhat modified. A pic and details of the modifications can be found here on the ///M Registry.
http://www.bmwmregistry.com/detail.php?id=6594
And as AlpinaMan pointed out, we have organized an event called Rolling the Twisties (RTT). Details about this year's event will be posted soon on the link in Alpinaman's introduction thread.
Here's a link to a video of last years event:
http://www.youtube.com/watch?v=N1TSch-APSs