Its quite hard to find a clear spot during the day or night as there seems to be lots of lorries or bends on hill climbs to deal with. I would have thought the Autobahn would have been made like a roman road.
The best bit is having the foot to the floor with no worry of any blue lights - only the lights of another BMW flashing you in the rear view!!!
I think it would have gone to 155 on a longer run - I may try again next year...
The official limit is 140mph for my 320si
I know bigger E90's have 155mph as their limit