My 300TE has seen north of 135mph.
My 1993 400E pulled to just north of the 160 on the speedo...
I dont think that they are quite limited. Or the chip actually works.
My 1996 SL600 pulls hard to 160, and keeps going north....
The G500 goes 115ish then stops accelerating...
I dont know about the 190E, but the fastest its gong is a few hairs north of 110.