AutoWeek.com has an article about the M6 race car that Alpina will display at the Geneva Auto Show. Apparently it will use a supercharged V8 instead of the V10 that comes in the production M6.
http://www.autoweek.com:80/article/20090206/CARNEWS/902069980
http://www.autoweek.com:80/article/20090206/CARNEWS/902069980