The Bilstein B6 2001 BMW 525i Base Front 36mm Monotube Strut Assembly is a high-performance suspension system designed to provide superior handling and stability to the BMW 525i. This strut assembly features a monotube design with a 36mm diameter piston for improved dampening control and a gas-pressurized design for improved response. The strut assembly is constructed from high-quality materials to ensure long-lasting durability and performance. It also features a corrosion-resistant finish for improved corrosion resistance. This strut assembly is the perfect choice for those looking to upgrade their BMW 525i's suspension system.