BMW made significant modifications to the 2006 M5’s suspension. At the front, the M5 gets more rigid bushings and a 0.9-inch wider track. At the rear, there’s a modified sub-frame, suspension links from the Z8 sports car, stiffer bushings, and hollow half-shafts for reduced weight and greater strength. The rear track is actually narrower by 0.6 inches so that the wider wheels and tires will clear the bodywork, but although the track is narrower, the footprint is actually wider. All four wheels get calibrated springs and shocks, and electronic dampening continually adjusts the shocks according to road and driving conditions to provide the best ride and handling mix. The 2006 BMW M5 also includes a limited slip differential and speed-sensitive steering that offers sport and comfort assist levels.