Hey, I was just about to post the same question. My 2010's system is shot. It seems that you either spend a grand for OEM or go with Walker or Bosal. Was looking at bosal but after some research found that their mufflers are complete junk. Walker makes a Stainless muffler that gets better reviews.
Use the convenient Walker online parts lookup tool to find the exact Walker exhaust parts that match your next repair need.
Walker 21746 and 21745 are the SS mufflers
Walker 21648 and 50365 are the resonator and y-pipe.
The only issue i saw was that the resonator and y-pipe are not a flange-bolted type assembly. Unless you know how to weld, I think the only option would be a band clamp. My question is if you ever used one of those clamps before?
Find a friend with a 2011 WRX sedan who is going to a louder setup and beg him for original setup. cat back it will fit in seamlessly or go with a magnaflo for wrx sedan 2011. i went with a new setup from Subaru mail order from one of our vendors here.It is a perfect replacement and sounds good. the magnaflo is cheaper but louder.