Okay... Now you are talking! I had all the same desires... I just got back from Best Buy and I think I now can dub myself a genius... Actually, none of this has come to fruition yet but... I think it will work... Firstly, I have been down the path already of invcestigating what I might find if I did get to the back of the radio. It seems that Subaru did neglect to add any inputs for accessories. Now that I have regretfully come to terms with that oversight, and lacking a tape player I am forced to go teh route of the FM modulator... As you know, they suck... BUT.... ALthough I am really trying to make my MP3 player work in the car through the stereo, the same challenge exists for XM and Sirius radio users... I found something cool for the same price as most of the other lame moduclators on the market. Now, I found one by DELPHI... Is is called the SKYFI FM Modulator. It is $49. It is hard wired in and has a pass through cord for your antennae lead... I think it is going to do the trick. It also has an additinal output lead that must be to power your XM unit.
As far as the 3 plug accessory plug... I have the same issue. I figure I am going to find a way to hook into a live lead once I get the consol open to install the modulator gizmo. It does suprise me that Subaru did not give any power plugs that stay on after the key is out of the ignition. I use it to charge my cell phone when I am out of the car and desperate!
So, anyway, I think this modulator gizmo, may be your answer. If you are interested to hear if it worked, write me back. I will install it as soon as I fine the instructions on ripping open the center console!
Let me know if you hear different...
Thanks!
Scott