@Artemis when we did our Stelvio tour one of the MunchenStammtisch guys (Thomas with the grey wrapped 1M) and I raced a few times on the autobahn. His car was completely stock. We were neck and neck(side by side) from 80 kph up too 260 kph. I was kind of shocked bc I expected to walk away from him(my 135i has 380 PS and 520Nm tune).
So... this 390 PS tune from BMW for their press cars makes total sense to me. I think there are still some cars out there with this tune.
Dack