There is an electronic speed limiter when the car is moving and there is a rev limiter but only when the car is in neutral, try your car in manual and see it go beyond redline by holding it in the same gear, trust me. But do not hold me responsible for any damage eek.
I did it on several MB. All of them would not rev on idle much above 2000 rpm and they will up shift about 600 rpm before redline. When I hold the gear by manual shifting, it will get closer to redline, but it will not pass it.