S4 and RS4 are very quick cars,the 911 turbo is hugely fast,its all to easy to get carried away and hit "jail" speeds very quickly.
Just about every car i have ever owned i have always clipped the top speed of the vehicle.
S3 150mph on and off in a race with a lancia delta integrale over 20 miles.
RS4 150 mph during testing of the cars after REVO trial software installed....Golich saw speeds of up to 180 mph.
If i wanted to stick to 70mph i would have caught the bus
Cheers fc