The R1 Concepts Geo-Carbon drilled-and-slotted rotor for 2008–2020 Subaru WRX STI rear left is a replacement rotor featuring a Geo-Carbon treated surface with drilled holes and slots. The rotor's machining is intended to assist heat dissipation and debris clearing to support consistent pad engagement, and it is supplied for the rear-left wheel position named.
R1 08-20 Subaru WRX Sti Rear Left Drilled & Slotted Geo-Carbon Rotor