See: The S-Class from Mercedes-AMG: combination of comfort and dynamism with E Performance
The E Performance model combines the AMG 4l V8 biturbo engine with the AMG-specific hybrid powertrain and a new expansion stage of the AMG high-performance battery (HPB).
Additionally, it possesses active roll stabilisation and active rear-axle steering, an AMG-specific radiator grille, and is considered to be the most powerful S-Class of all time.