KresoF1:

Markus, I have to ask why?

720S is clearly the fastest sportscar on the autobahn. Lack of real LSD or e-diff, narrow tires and suspension mainly tuned for road use are a handicap on the track. 

The turbo s is also tuned for road use... Also, the 720s is brand new, one should expect it to outperform the „old“ turbo by far...