2005 Subaru WRX

Engine Mechanical problem
2005 Subaru WRX 4 cyl All Wheel Drive Manual 100, 00 miles

my friend has a 2005 subaru wrx and he says it has a blown valve and he is selling it for 5k and I am a guy that can work on cars but have always been a General Motors man working on those cars
so I am in need of some answers
i want to fix the problem with the subaru in my garage
so I was wondering how much it would cost roughly in parts, if there could be any other serious damage to the car, or should I not touch the car and look for something else because he is asking too much money
thank you
February 15, 2010.

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