The KW Coilover Kit DDC 39080029 is a suspension upgrade for vehicles that allows for adjustable damping and ride height. This kit includes four coilover struts with adjustable spring perches and dampers, as well as a control unit that allows for on-the-fly adjustments to the suspension settings. The DDC (Dynamic Damping Control) feature allows for automatic adjustment of damping based on driving conditions, while the adjustable ride height allows for customization of the vehicle's stance. This kit is designed to improve handling, performance, and overall driving experience.