Okay, I assumed you were asking if the Trans mated to the engine in the pic. I'll pose these as questions since I'm no expert.
1. Is your friend in Europe? I (like Alan) assumed that the engine is an s38, which came in the US M5/M6. It is based on the M88 block.
2. I assume the Trans is a G280, but it basically looks the same as a G265
3. Do we no have members on here with a G265/6 bolted to an M90, replacing the close ratio dogleg? If so, Isn't the M90 block based on the M88? If so, why wouldn't a G280 bolt up to an M30?
The g280 is a special transmission. It is close ratio like the dogleg but it has a standard shift pattern. They are expensive to buy and extremely expensive to rebuild. Several folks on here have e28 M5's. Perhaps they can chime in...