I replaced one on an 2009 WRX a few months back. same issue. under WOT full boost the turbo would make a very weird air suction noise, replaced the turbo under warranty at around 28k miles and it was as good as new. the customer also got a free release bearing under warranty, it was a good job, I got it done in a day and it paid almost 8 hours between diag. turbo replacement and throwout bearing replacement.