The upper front suspension control arms (integrated with a steel structure), and the air dam structure are made from, or combined with, composite materials. (iimediaevents.com)
Active Roll Stabilization is an active suspension control system designed to reduce body - roll, or lean, while cornering. (bmwusa.com)
The active suspension control system combines with the damper control system and the air suspension to keep roll to a minimum while still keeping things cushy. (autoguide.com)