The Bilstein 12-16 BMW 528i xDrive B6 Performance Twintube Shock Absorber - Left Front is a high-performance shock absorber designed to provide superior dampening and stability for your BMW 528i xDrive. This shock absorber features a twintube design with a gas-pressure monotube construction that reduces the risk of fading and ensures consistent performance. The shock absorber also features a high-pressure nitrogen gas charge that increases responsiveness and reduces the risk of cavitation. With its durable construction and superior dampening, this shock absorber is the perfect solution for those looking to upgrade their BMW 528i xDrive's suspension system.