Torque steer
There are special differentials that will reduce torque steer and change its effect. On the Focus RS they have a clever setup, but if you boot it out of a corner it locks the wheel so you cant turn! you have to back off a bit to get it to turn properly!
I don't get much torque steer on my 155 HGT, so I doubt it can be imporved on very much - diffs are expensive an complicated to install/work on.