The Koni Sport (Yellow) Shock 03-10 BMW Sedan 525i/ 535/ 545i excl. Xi/ GT & air suspension - Rear is a high-performance damping solution for BMW sedans. It features an adjustable rebound setting, allowing you to fine-tune your suspension to suit your driving style. It also features a patented valving technology to provide superior handling and improved ride quality. The shock is designed to be highly durable and resistant to corrosion, and it is backed by a limited lifetime warranty.