DBA 4000 Series Rear Slotted Rotors (Pair) - Subaru STI 2004-2007T3 4000 Series Rotors are DBAs most advanced one piece brake rotor on the market. These rotors are designed to perform in extreme road and race applications. Position: Rear Features: T3 Slot 48 precision CNC machined slots that are tri symmetrical curve slots Slots create out gassing exit points for brake pad friction gasses to escape Increased surface area resulting in great er heat dissipation Kangaroo Paw 144 diamond and teardrop pillar ventilation