Unless it got a pre 02 WRX transplanted engine in it, I would punch the guy in the nose and ask if the dickhead reads his manual in the glovebox!!

Stay away. More than likely it has been pinging its little head off, especially in summer.
Engine damage more than likely.

The seller is an idiot.

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"You can turn your back on a person, but, never turn your back on a drug. Especially when it's waving a razor-sharp hunting knife in your eye." - Raoul Duke