KYOSTAR Carbon Fiber Strut Brace for BMW G80/G81 M3, G82/G83 M4 & G87 M2 The KYOSTAR Carbon Fiber Strut Brace is designed for selected BMW M applications, including the G80/G81 M3, G82/G83 M4, and G87 M2. Developed for the automotive performance aftermarket, this vehicle-specific brace provides an upgraded engine-bay component for BMW M performance and customization projects. Its integrated brace design and carbon fiber construction make it suitable for automotive performance