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Do a gasket leak test before you buy, also when you test drive it turn on the heat and if it smells like a burning rubbery/antifreezy smell dont buy it, check oil for water as well, look for a creamy kinda mixture in the fill tube and on the dip stick
I worked at Carr Subaru for a while and can tell you that alot of the cars that rolled in for service were in there for glown head gaskets. It wasn't just specific to WRX's, Foresters, Legacy's etc... Just like people are saying above, pretty much all of them had 90K + miles. Timing belts were another item getting replaced. If the car is in good shape and they changed the oil often I wouldn't worry about it too much. Boosted engines due put added stress on head gaskets especially if its turned up past the stock recomendations. Its still a Subie though, there dependable even in the turbo models. They recommend running premium gas on the turbo cars though, which is the only part that kinda sucks.
i couldnt imagine doing a headgasket on a boxer engine.. fuck that shit. i would pay somone to do it.
I'm having my 2.5l head gaskets done tomorrow for $450. Gotta buy the felpros myself though so that's another ~$150. Still not bad though, if you're in the WMass/N.CT area and need a cheap, great mechanic let me know.