Well, in the FC's DTSS "system," when you corner hard enough these two rubber bushings (one per side) will actually squish and give the car 1* of positive toe in the direction of the turn.

Take a hard left, and the right rear will toe out 1*, while the left rear will toe in 1*.

This gives a novice to intermediate driver the feeling of better grip and more turning power. Anyone who is used to "normal" rear drive cars will feel them as twitchy and unstable at the point DTSS "activates" and once again when you go past it's ability to flex making it more difficult to tell when the car is going to let go. Polyurathane or delrin bushings eliminate that twitchy feeling for more normal, more predictable cornering.