Much like a mechanical limited-slip differential, torque vectoring subtly pulses the brake of the inside front wheel in a corner, directing more torque to the outside wheel, actually helping bend the car into a corner.
But I see now, as I'm accelerating out of a shallow banked turn around 120 mph and I feel the torque-vectoring differential sorting itself out, that I've misjudged the car.
The M5's reinforced active locking and torque-vectoring rear differential (the Active M-Differential) brilliantly adjudicates traction between the rear wheels.
Both cars can be equipped with optional torque vectoring, a brake-based system built to augment the mechanically locking rear differential and help put power to the ground.