The affectionately called "Schuur Horn" provides a more linear steering geometry for your RX28.  By moving the pivots of the steering horn to the front, we achieve a higher angle on the links which created less ackerman effect on your front tires. The result is a steering feel that is much less exponential as dual rate is increased.  This can allow you to run less steering throw in high traction conditions, or set up more aggressively for tight tracks with 180s where more throw is needed.