Street Series T2 rotor provides all the benefits of DBA�s Street Series direct replacement rotors with the added benefit of the introduction of DBA�s patented T2 slot design.. The T2 design features precise CNC machined bi symmetrical slots, resulting in a quieter, more responsive brake pedal feel.. The T2 increases the number of exit points, allowing friction dust and gases to escape thus enhancing the pad bite.. T2 is denoted by the suffix (S) in Street Series part numbers.