4" duct is pretty massive, 4x the air flow vs 2" duct. If you want to make the most of it you could do a 4" to 2x 3" splitter and produce an alternate hub flange that accepts 2x3" (hardcore) or direct one hose to cool the brake caliper.
Teams that run multiple brake ducts to the rotor usually just block one off if they are running at a track that isn't that demanding on brakes in order to get the temperatures into the ideal zone.
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