Roadster 

Engine Original Power Stage 1 Difference Vmax
3.4 S 221 kW (301 hp) 362Nm 236 kW (321 hp) 390Nm 20 hp
5.0 V8 280 kW (381 hp) 520Nm 310 kW (421 hp) 530Nm 40 hp
5.0 V8 294 kW (400 hp) 500Nm 310 kW (421 hp) 530Nm 21 hp