The EBC Ultimax slotted rear rotor set is specified for 2017–2021 Subaru BRZ 2.0L applications and is a vented OE-style disc at 316mm diameter and 20mm thickness. The Ultimax slots are designed to draw in cooling air for more consistent braking and to clear dust for improved pad contact, offering the quieter slotted-rotor behavior highlighted in the source description.
EBC 17-21 Subaru BRZ 2.0L RK Premium Rear Rotors