German vs US built type 4 engine differences?

[kdanie]

Oliver, I asked in a previous thread but I don't think you saw it. We were discussing the differences in how type 4s were configured in Germany and in the U.S. and how that might affect the aparent lack of HP we seem to be getting over here.
I would like to know what compression ratio is commonly used in a German high performance type 4 might be and what quality of gas (octaine rating) you have available.
thanks,
ken