According to the B4 manual, the higher the castor amount the more initial steering you gain and less exit steering...and therefore if you run less castor you get less initial and more exit.
However, before I started racing 2WD I was always under the impression that more castor gave less initial and more exit, whereas less castor gave more initial and less exit.
Maybe its different for 2WD and 4WD? I have no idea
