I´ve done this last weekend.
Arrival on Sunday and BMW on Demand M6 cabrio reserved for Monday.
The A8 to Munich was almost free to drive without speedlimit.
But be aware, there are a few new track sections on the freeway, so the speedlimit will be reduced to 120, 100, 80 just for this sections and then they are free to drive without speedlimit again.
You can also drive to "Kochl am See" which is also a nice track to drive!
You will have a lot of fun
