It looks as though the MP system has diverter valves to avoid the final silencer.
So it could be a lot more fruity in Sport Mode.
The Sport Mode switch could be set to change the exhaust flow.
The 2017 AMG C43 does that: in Sport Mode it would fail its noise test, which is why the handbook says it is only for use "where permitted by law", or something.
In fact on the 2017 model the loudness is selectable by the driver, but in the 2019 face lift version and in my 2019 A43 the exhaust noise is not user selectable separately from driving mode.
