Always pre-purchase inspect a vehicle. Despite this advice being worth null in hindsight, take it to a subaru specialist for a look over (s-technics, maximum motorsport, race torque etc..).

Could be a trivial problem, easy fix and the like. A well maintained wrx can last a long time.

Also, maybe someone knows about the "lemon laws" applying to personal sales?

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Slow is smooth and smooth is fast.