BMW M-Performance BBK – 370/380mm Front & 345mm Rear Calipers (E9X, F2X, F3X, F8X M3/M4) Enhance your BMW’s braking performance and visual appeal with the genuine BMW M-Performance Big Brake Kit (BBK). This high-performance upgrade includes large 370mm or 380mm front rotors paired with powerful multi-piston calipers, and 345mm rear rotors with matching calipers. Engineered for optimal stopping power, heat dissipation, and fade resistance, this BBK is ideal for aggressive street driving, canyon runs, or track days. Specifically designed to fit E9X, F2X, F3X chassis, as well as F8X M3/M4 models, this kit maintains OEM fitment and reliability while significantly…