The Turbos all but requires UEL for different design reasons, heat, location, etc., but that does not make them optimal. In general, EL allow for the best flow and performance. That is probably why Subaru went that way on the NA in addition to it being cheap and easy.
I can't find a picture of the stock midpipe, but if it isn't too restrictive, an axle back might be all it would take to loud it up a bit. A quick google search didn't find any, but judging from the aftermarket cat backs, I would guess one could be fabbed for 2-300 bucks.