I had a 09 STI hatch for almost 4 years. Stock turbo, 200cells Invidia downpipe and a Q300 muffler. Got a ecu flash from Ecutek. This car is a beast, 365 hp and 530Nm measered at 10 Celcius.
I was the first and probably the only one that got two broken spot welts in the NL.
Another weak spot is the steering pump. I replaced my but still got noises, probably the steeringrack itself.