How much do you think it's the limit for normal driving on usual roads, the almost 2 tons, rear wheel propulsion car like the X250 XF?
For me, the initial 211 BHP (450 NM) was more than peaceful and relaxing. It was like a Mercedes but fun to drive.
Then, with the powerbox and the estimated real 240 BHP (500NM), the car was even better but still relaxing most of time.
Now with the chip tuning quoted for 290 BHP and 610NM, the car is very very fun to drive but not relaxing anymore, at least for winter temperatures and humidity. I'm finding myself paying lots of attention when overtaking and even straight ahead acceleration or stopping. Even at junctions when I need to let other cars to pass, a very small accelerator touch moves the car away than before when it was starting to start rolling the wheels.
My conclusion is that the almost 300 BHP (600+NM) is the limit for this car for usual usage. I don't know for a circuit but almost 2 tons don't look good for circuit either. Don't know how it's the XFS, if it's a big difference compared with my car now (I don't think so) but I'm hoping to get some answers from XFS owners and also from tuned or XFR owners.