The headgaskets have been done twice now, first time was by subaru under warranty at about 30000 then went again at 110000 was replace by mechanic and now they're blown again. I recently discovered blowby as well. I'm thinking of doing it myself, since I don't trust mechanics, plus my dads a mechanic. But being my first time what else should I probably replace while its open. We have another car I can use so time isn't an issue but I want it done right. I love this car and plan on using it into the 300k range.