Impressive S6 performance is thanks in part to the grip of 265/35 performance tires wrapped around 19-inch alloy wheels, which in turn, are connected to a speed-sensitive rack-and-pinion steering assembly and sport-tuned, multi-link suspension that sits 25-mm lower than the A6. Standard stability and traction control systems as well as front and rear locking differentials are employed to stay the course. A Torsen limited-slip center differential is also standard equipment. When behind an inattentive driver in traffic or approaching a gnarly 90-degree right hander, the S6’s stout antilock braking system utilizes front and rear ventilated discs to slow things down in a hurry.