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Bilstein B6 Performance (DampTronic) Suspension Front Left Strut Assembly for 2021-2025 BMW M440i xDrive (G22/G23) bilstein-b8-performance-plus-30mm-monotube-suspension-strut-cartridge DOT-rated Integrated Valves No PortBilstein B6 Performance (DampTronic) Dampers for the 2021 2025 BMW M440i xDrive (G22 G23) are a performance upgrade to OE Dampers designed to be paired with OE factory springs. All of the active features of the factory electronic suspension, along with the factory controls, will be retained with the installation of these Dampers. Each damper is rigorously tested for quality that meets or exceeds OE standards and features application specific valve