http://www.sema.org/sema-enews/2011/...ermarket-parts
Every dealer is different in my experience, its pretty stupid since they all are Subaru dealers. But when it comes down to it they have to prove the part was the problem. I have not done a crank pulley for this exact reason. An over pipe and drop in panel filter are the closest I'm getting to changing the engine, its to new and I don't want to get stuck with some big bill because these things develop a problem. The suspension and brakes on my car are completely changed so I accept that if say the something in the brakes fails I'm probably not covered.
In the end Subaru and the dealers are a business, they want to pass of the expense of any repairs to someone else is they can find a reason to.
I see the OP is in Mass so I will say that the dealer on 114 in Danvers hates aftermarket stuff, even hates if you do your own oil changes.