No Baffle in Aalen is not a problem. They split the classes into Pro & Street and further divide by displacement.
I ran unlimited street... But I had everyone covered by a few tenths and 10-15 mph. There was one Pro NOS Bike that ran high 8's because he could 60 foot. He measured and changed clutches between every pass.
Most ran NOS and there were a couple Turbos...
In Hockenheim, you will need a baffle of some sort... they are strict about the noise there.
Drag Racing in Germany is done via heads-up... Time Trials determine the ladder for eliminations when they have them, if not... the fastest in time trials wins the class. NO BRACKETS from what I have seen...