very interesting project as not that much of people tuning the m111 engine, is that a 2.3 from kompressor model? does it running upgraded internal or stock? on stock head or also upgrade? at what rpm do you have full boost as that turbo is huge. sorry for so many questions i just like to see more info on the engine, as that the highest hp number from m111 which is great works.
If you want an automatic gearbox people here use the 722.3 with high hp numbers, or you like to keep it manual you can adapte bmw zf or getrag which i also saw people run it which great number
Again great build, keep us updated

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W123 - M111+Turbo