I recently reported 2 problems i.e.

- car pulling left when braking hard
- coming out of a corner the steering did not come automatically
back to it's straight ahead position, it seemed a kind of stuck.

I did following:

Checked the brakes but same upgraded only 6 months ago so no problems found.

Replaced wheelbarings on all four wheels.

Probably most importantly found that the wishbone rubber on the righthand side was gone probably allowing the rightwheel to jerk forward on heavy breaking.
Was told the WRX rubbers have oil inside to get a bit of flexibility whereas the STI rubbers are solid and therefore firmer and stronger.
Have now STI rubbers on both sides and car steers and brakes ok now so it's full blast ahead again!