Yea, GMR is pretty fun. I've done 2 runs with BimmerPost guys, and many with just my close friends.
http://www.e90post.com/forums/showth...&highlight=gmr
http://www.e90post.com/forums/showth...&highlight=gmr
Audi R8? Man, that must be quick. Where'd you go wireless? Angeles or Glendora?