Nice comparison. I don't like the Subaru exhaust finishers on the 11 (or any car for that matter) but I do like the quad-tip exhaust look.
My first recommendation is to get overlays for the tails. Makes a HUGE difference and is well worth the money...mine make me smile every time I see them.
I agree that the turbo in the '11 is nicely paired with the engine. It's extremely responsive but does seem to build boost more slowly than I'm used to (coming from a modded Evo). But with all of the 2.5L torque already there you don't need the turbo as much as you do in a 2L.
And as for cold startup, my Perrin sounds nice and mean and I love it. It's a lil louder but it's not offensive to the neighbors.