Generally, turbo blankets aren't used on stock turbos because they can interfere with the wastegate actuator arm. With enough creativity though, it could probably be modified to work, but the easiest solution is some type of turbo heat shield.
I'm using a Prosport turbo blanket, but I have an external wastegate.
I'm fairly certain that PTP designed their Subaru turbo blankets with the wastegate actuator arm in mind. I have an email to them asking if there are any fitment issues with a stock turbo setup. The main reason I am interested in getting the turbo blanket is because it is only slightly more expensive then a turbo shield and seems like it would do a better job.