M850i xDrive official specs:
4.4 L twin-turbo V8
523 hp / 553 lb-ft
0-100 km/h (62 mph) in 3.7 seconds
U.S. starting price: $111,900
AMG S63 Coupe official specs:
5.5 L twin-turbo V8
577 hp / 664 lb-ft
0-100 km/h (62 mph) in 3.9 seconds
U.S. starting price: $169,900
The race starts at 16 minutes into the video.