I used 6 star gaskes on my wifes 2008 legacy when I did hers 2 years ago. They are stainless steel so no future worries about bi-metal interaction and I no longer have to use the Subaru coolant or an additive. They were a bit more expensive but are worth the price cause we plan on keeping the car for our daughter. I believe hers was externally leaking coolant down the backside of the left side of her engine. Everything pressure checked good but you could smell the coolant from time to time. Make sure you spend the extra and have the heads machined or at least checked to be sure they are flat, cost me about $170 but I had new valve seals put in too just because. And as some have mentioned, timing setup replacement is smart at this point.
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