This write up is for how to install/remove the stock radio on a 2011 Subaru Legacy 2.5i without Navi or HK system. It may work for those as well. Also I installed a SINGLE DIN radio, it shouldn't be any difference if you installed a Double DIN radio.
THESE ARE THE PARTS THAT I USED
Scosche #NN04B (I know it shows up as nissan but it is the same)
First thing you need to do is pop out the center piece. DO NOT USE A SCREW DRIVER.
According to some manual, it says to stick your finger in the vent and open it. Don't do that either, because it hurts and it does not work. Just stick your hand in the center pocket, make a fist to grip it, and pull outward. Be careful not to scratch anything.
The RED circle are the main points that holds the column in.
On the left where I put the green circle, it is recommended to put a piece of tape on the side instrument panel so you won't scratch it. I didn't do it and it was fine.
The whole piece just comes out. Once you put that in a safe place, you need to unscrew the stock radio from the car. There are 4 Philips screw holding it and they are located at the YELLOW TRIANGLE. **use a big screw driver, these screws are very soft**
Once you unscrew the screw, there are TWO big plug holding the deck and one black wire sticking out near the bottom which is the antenna.
The two big plugs are easy to remove, the antenna one on the bottom was a little tricky. You need to go from the bottom of the driver side to take it out because you unplug it from down there.
The bottom pictures shows how where to disconnect the antenna wire. I also have the new aftermarket antenna wire plugged in to show you.
What is mission from that picture is the antenna extension because you WILL need one to make it reach your new deck.
Once you are done it should look something like this.
If anyone have any question feel free to PM me or just reply here, I will try my best to answer it.