That's odd. I asked them about the 2011 Citadel 2wd and they said that they didn't have plans to make it as of right now. I guess they passed over the 2011 and went with the 2012. I will have to call them and see if it fits the 2011.
UPDATE: I went to the Borla site and when you checkout with them it shows 11' and 12' models. Expensive though. I'm having a buddy price it locally to see what's up.