Vehicles with an AMG engine: it is not possible to use kickdown in manual drive program M.

You can also use kickdown for maximum acceleration in manual drive program M.

Vehicles for USA: fully depress the accelerator pedal.
The transmission shifts to a lower gear depending on the engine speed.
Vehicles for Canada: depress the accelerator pedal beyond the pressure point.
The transmission shifts to a lower gear depending on the engine speed.

During kickdown, you cannot change gear using the steering wheel paddle shifters or the selector lever.