M550d xDrive
381 hp
3.0l, in-line 6, ''tri-turbo'' (what ever it means )
740 Nm
0-100 km/h: 4.7 s
Average consumption: 6.3 L/100 km (37.3 mpg US / 44.8 mpg UK)
CO2 emissions: 165 g/km

X6 M50d
381 hp
3.0l, in-line 6, ''tri-turbo'
740 Nm
0-100 km/h: 4.9 s