120 autocross laps and 22,000 miles, with stock brakes:
Power steering: No leak.
Brakes: No problems, but will go to a street/performance pad next season in hopes of gaining a little more initial bite.
Engine: No issues.
Bushings & Subframe: No issue. However, I'll be putting the 'vert rear sway bar on my coupe over the winter and I plan to replace bushings while the subframe is dropped.
I've autocrossed various cars for decades and never had a "failure" or problem related to AXing the cars, other than accelerated tire wear.