As mentioned by the poster directly above, the European figure is 275kW (374hp) according to the EU press release:
https://www.press.bmwgroup.com/globa...18?language=en
That is just a 8hp shy of the the US figure and significantly more than what the Z4 M40i will get in Europe according to the EU press release for that vehicle:
https://www.press.bmwgroup.com/globa...ch?language=en
The discrepancy is surprising, and I am now struggling to understand how the EU regulations work.