The M5 CS is BMW’s most hardcore M sedan ever made. Lighter, stiffer, faster. Realistic Physics brings out the duality of this car: the balance of a long-wheelbase executive chassis paired with razor-sharp agility. The carbon roof and bucket seats help shave weight, but the real secret is in the recalibrated AWD system that allows for seamless transitions between stability and controlled oversteer. At high speed, the dampers tighten and the front end bites harder than you’d expect…