It's simple math really.
The axle ratio is 3.197
5th gear ratio is .804
tire diameter is 26 in.
Given these numbers, if your limiter in 5th gear is at 6400rpm, the top speed would be 192.59mph
If the limiter is raised to 6800rpm (as mine is), the top speed would be 204.63
Obviously, this is theoretical, as you would need the horsepower to fight the extreme wind resistance of this speed.
Avus Silver RS6 - Viper Stage 2 ECU/TCU - Water/Meth Injection - Frozen Rotors - Hbars - clear corners - Hella smoked tails - gutted precats