Our tentative itinerary is coming together:

4/30: Fly to Munich
5/1-/5/2: Tour around Munich
5/3: Drive to Stuttgart, Porsche Factory Tour AM
5/3: Drive back to Munich, BMW Plant Tour PM
5/4: Pickup Cars and drive to Southern Bavaria
5/5: Tour Bavaria
5/6: Head to Nürburgring
5/7: 24 Hours of Nürburgring Race
5/9: Drop off in Frankfurt and take train to Amsterdam
5/12: Fly home