StopTech 2 Piece AeroRotor Slotted 326mm x 30mm 2003-2015 Subaru STi (pair)StopTech 2 Piece Slotted AeroRotor Kits are designed to replace Original Equipment rotors on your 2003 2015 Subaru STi, while retaining the factory brake calipers. The same size as Original Equipment, the two piece, directional, floating AeroRotor offers improved cooling, braking and handling. AeroRotor rings feature StopTech's patented AeroVane internal vane design to optimize airflow. The rings are pre assembled to billet aluminum AeroHats for