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The GiroDisc slotted rear ring for 2018+ Subaru WRX STI installs as a slotted friction surface to help maintain pad contact and evacuate gases and debris. Note: these rings require trimmed rear pads for proper fitment on WRX STI rear calipers. They replace the rear rotor face and should be fitted only after confirming pad trimming and compatibility.
GiroDisc 2018+ Subaru WRX STI (Requires Trimmed Rear Pads) Slotted Rear Rings
