I'm pretty impressed. The weight loss is great, as the e92 was looking a bit fat (that's the price of a V8) and the fact that it has a decent red line for a turbo is good also.
You can see how much the N54 was missing to be a track car with this M though. Far better intercooler and oil cooling etc. No mention on the fuel pump though :P
The engine bay looks packed though. All that gear to not make it limp like an N54 probably probably adds up to 50kg or so!