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A compression test is highly recommended. Get the oil filter cut open to check for metal. Stock is almost always better for a car like an STi. If it has an intake, make sure it's been tuned. If you can get ahold of a Tactrix cable, pull a "Learning View" to see if the engine has had much knock/detonation.
TSS took care of inspections for me when I was looking for a Legacy 2.5GT wagon (similar shortblock with similar piston issues).
cheers
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