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.
2014 ///M5 Individual Frozen Grey, Silverstone Full Merino, Piano Black, Exec Pkg, Drivers assistance plus, LED Pkg, Bang and Olufsen, 20" 343M Forged Alloy Wheels
Countermeasures: Bel StiR+, Laser Interceptor Quad HP, Zaon MRX
Upgrades: Eisenmann Sport with M Performance tips, Dinan anti-roll bars