The 2011 MY is pre-wired for tweeters. These wires are plugged into the sail panels (the little triangular plastic pieces in front of the windows). If you buy a factory approved tweeter kit, you will get new sail panels with the tweeters in them. All you have to do is to pry off the OEM sail panels, connect the wire and snap the assembly back on.
Be sure you have everything ready to go before you try this because there is a 50-50 chance that you will break the sail panels when you pry them off. These little suckers are connected to the door frame with a barbed steel clip and they can get stuck so there is no way a sail panel will come off in one piece.