Originally Posted by rs10

My understanding is that the Guard differntial is customizable, including after purchase, and that certain setups work better on the street whereas others work better on track. I also understand that with a track biased Guard differential, on the one hand, it will maximize power put down in tight turns, but on the other hand, excess throttle when exiting tight turns can trigger understeer.

What I'm not sure about is whether the same would be true if a Guard differential is set up for street use, even if presumably to a lesser degree. (Though Powderhound, if your differential is set up for street use, then the answer is probably no.) And based on other (somewhat vague) posts that I perhaps only vaguely remember, I'm also wondering if it could increase understeer and/or inhibit turn-in in other situations.

And regarding the understeer with excess throttle situation, there is the question whether even more excess throttle can solve it.