This Bilstein B4 OE Replacement 04-06 BMW X3 3.0i L6 3.0L Rear Twintube Strut Assembly is a direct replacement for the original equipment (OE) strut assembly on 2004-2006 BMW X3 3.0i L6 3.0L models. It is designed to provide improved ride comfort and handling, while also reducing noise, vibration, and harshness. It features a heavy-duty steel body and a monotube gas pressure design, which helps to improve handling and stability. It is also corrosion-resistant, making it a great choice for long-term use.