Thanks for the info. I've already read the hp in the latest AMS. They stated 550hp equal to your source. But nothing about exhaust improvements or performance figures is mentioned. So your source seems to be more reliable. Maybe you would have gotten more infos by a higher level of alcohol? :-))
X- drive would be a great improvement for an high power sedan. With x-drive the new M5 would be one of my serious choices as a replacement for my current X5M.
The other possibility is the Panamera Turbo S.
So I'm approaching to an old question:
BMW or Porsche? Understatement or not?
Well, will see what happen...
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Kind regards, Conny
Porsche 997.2 Turbo S * BMW X5 M