MKSGR:
Whoopsy:

On the unrestricted we were up past 250-260km/hr at times, but the car is not stable at all above 200km/hr, cross wind affects it very much. Maybe it was the winters tires that was only rated to 240km/hr.  

It was probably just the unusual weather - was quite windy the last days in Germany Smiley 

+ the winter tires with our spring like temperatures at the moment.

A basic 991 is stable at 250 Km/h, why should a 991 R be unstable?

Blueflame