Our first drive was on two-lane country roads in what used to be called East Germany. Most had smooth new pavement. However, some of the surfaces were horribly skewed cobblestones and nestled blocks. The C4 we drove first sailed over them with dignity, absorbing the small and medium bumps just as the engineers promised.
Next, we drove a C4 on what amounted to an auto-cross course improvised on an abandoned Russian airfield now used by Michelin, Mercedes, Audi and Porsche for driver training and R&D. As instructed, we left all safety systems on so that we wouldn’t hit anything, though there was precious little out there to hit. Hammering along on a left-right transition, we did get the back end to start moving outbound once. The PASM, PTM and PSM immediately went to work to get the car back in line. It might have taken longer than the advertised 0.1 second, maybe 0.2 or 0.3. But it was never scary. Not like those old 911s.
There was–again as promised–no hint of forced understeer caused by the front diff closing up, no matter how badly we overdrove into corners. Nor was there any wheelslip from the rears powering out of tight bends. We couldn’t detect torque transfer from front to rear, except that it seemed to work quickly enough to keep the car in line.