Spring Kit for Coupé (G15) M850i xDrive, 840d xDriveProduct Information: Philosophy Engineering Setup Suspension components from AC Schnitzer improve driving dynamics and safety. Essential requirement for this is that the wheels always have contact with the ground, and that road holding, cornering stability, braking and steering safety are guaranteed. "In principle, the car should handle the same as a standard vehicle. Good natured load change reactions and gentle understeer in the limit zone are