will a muffler from a 2015 subaru wrx fit a 2009 subaru forester
measure both to compare if you have the available space. A muffler shop can custom work the connections to match it up with your current piping and install custom hangers. Maybe check with them first?
A turbo muffler is one step closer to having a bargain WRX don't ya know. ;)
It's easier to just let the old pipes get old and leaky, as it sounds the same!