The so called "surface-to-surface missile" Audi RS6 on the German Autobahn during busy early morning traffic. Some call it the ultimate Autobahn weapon - they're right - no chance in reality... 
Head to Head:
BMW M135i (Automatic): 2979 cc R6 turbo
Weight: 1515 kg / 3340 lb
Max output: 235 kW / 316 bhp
Weight to Power ratio: 10.76 lb/bhp
Max torque: 450 Nm
Sprint 0-62mph: 4.9 s
Top speed: 155 mph (limited)
Audi RS6 C7 Avant: 3993 cc V8
Weight: 2025 kg / 4464 lb
Max output: 412 kW / 553 bhp
Weight to Power ratio: 8.07 lb/bhp
Max torque: 700 Nm
Sprint 0-62 mph: 3.9 s
Top speed: 155 mph to 190 mph (limited)