4000 Series XS Drilled & Slotted Rear Rotor

• 2018-2021 Subaru | WRX STI

The DBA 4000 Series XS brake rotor is a direct replacement single-piece rear brake rotor for the Subaru WRX STI (2018-2021), designed for drivers seeking upgraded performance braking above and beyond standard OE levels.

• Part Number: 43051XS-10
• Position: Rear
• Rotor Type: XS Drilled & Slotted
• Construction: 1-Piece
• XG-150 high carbon alloyed iron and Thermal Stability Profiling (TSP) for increased rotor stability and durability under intense braking
• Kangaroo Paw ventilation — 144 diamond and teardrop patterned pillars for increased surface area and cooling efficiency
• Symmetrical slots and chamfered drill holes facilitate the exit of friction dust and gasses for a quieter, more responsive pedal feel
• Bi-directional symmetrical slotting and drilling for universal left/right use
• Thermo-Graphic paint markings change colour at specific temperature thresholds to monitor braking temperatures
• Dual-drilled for 5x100 and 5x114.3 fitments
• Direct replacement — no modifications required
• Sold individually

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