The Bilstein B4 1997 BMW 540i Base Front Twintube Strut Assembly is a high-performance strut assembly designed to provide superior handling and stability for your BMW 540i. This strut assembly features a twin-tube design, with a monotube inner tube, and a twin-tube outer shell. The twin-tubes are filled with Bilstein's patented gas pressure technology, which provides consistent damping force under all driving conditions. This strut assembly is designed to offer improved cornering ability, better steering response, and improved ride comfort. Additionally, this assembly is corrosion-resistant and built to last.