This High-Performance StopTech AeroRotor replacement is designed for Big Brake Kit (BBK) systems. The patented AeroRotor features a unique internal vane design that improves airflow by up to 80% compared to standard rotors, ensuring superior cooling and reduced brake fade under extreme conditions. This is a Left-Hand (Driver Side) slotted rotor ring, specifically engineered for 380x32mm configurations. The kit includes: 1x StopTech AeroRotor Ring (Left, Slotted), Part Number: 31.836.1101, and 1x Rotor Mounting Hardware Kit with anti-rattle washers, Part Number: 140.0001.00. Ideal for track days and high-performance street use.