Wow. It must be brilliant to do this with a friend in another M5! And those are some really nice pics you have.
Agree on the Audi drivers. However I also thought the Austrian drivers in general had a tendency to obstruct. In Germany and Switzerland they tend to keep right and let you pass.
2013 ///M5 Individual
Monte Carlo Blue, Platinum Full Individual Merino, Platinum Alcantara, Piano Black, Exec Pkg, Drivers assistance pkg, Bang and Olufsen, 20" wheels
Eisenmann Sport Exhaust, Bel STiR+, Laser Interceptor QUAD HP, Zaon MRX