While you can adjust front/rear torque split you can not go 100% to either end. First year USDM STi’s had the broadest available torque split, at 35/65% front/rear. Later models had less of a spread available, though I don’t recall the numbers off the top of my head and which year that spread reduced. Regardless, 65% rear was the max ever in a USDM STi.
-TJ