Cusco
Cusco Pro-Adjust Kit RS LSD Front GDB/GRB/GVB STI
$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 front LSD on GDB, GRB, and GVB Subaru STI models. Shims and springs to retune engagement preload and ramp bias on an existing unit — rebuild the diff to a different spec rather than replacing the whole thing.
Particularly useful after a season of track use when you want to tighten or loosen front engagement to match a change in setup or driving style.