Cusco
Cusco Pro-Adjust Kit RS LSD Rear STI GC8/GDB/GRB/GVB
$3,118.31
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Part price$3,118.31
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✓ Confirmed-fit parts — add your vehicle in your Garage to check fitment.
Pro-Adjust service kit for the Cusco RS plate-type rear LSD in the R180 differential on GC8, GDB, GRB, and GVB Subaru STI models. Includes the shims and springs needed to retune engagement bias without pulling and replacing the diff unit.
If the car has been on track a lot and the diff feel has changed, this is the rebuild/retune kit that brings it back.