Around this time of year, ahead of Le Mans, Audi has gotten into the habit of renting out the Autodromo Nazionale di Monza for some testing. To simulate the long straights of la Sarthe, the first chicane is bypassed. This means the cars get to the the Biasonno/Curva Grande at well over 200 mph.
It's worth noting that current LMP1 cars produce much more aero downforce than Formula 1 cars and it is only their weight and higher center of gravity which prevents them from being faster than their open wheeled cousins, like prototypes used to be back in the 60's and 70s.
In the second video what is possibly a camouflaged 2015 Audi R8