Not STi but WRX question......
So far I have not detected a tendency to understeer in my STi. I have pushed it until the RE070's have howled and the only thing I felt was all four tires sliding or throttle on oversteer I have been driving my WRX in competitive autoX for three seasons now and the STi is much much better, limited trail braking and throttle on cornering is awesome, not easy to do, but awesome.
So far I have not detected a tendency to understeer in my STi. I have pushed it until the RE070's have howled and the only thing I felt was all four tires sliding or throttle on oversteer I have been driving my WRX in competitive autoX for three seasons now and the STi is much much better, limited trail braking and throttle on cornering is awesome, not easy to do, but awesome.