By popular demand, I'm now offering an SVX-to-14-pin Plug-and-Play Harness. This enables you to install an OEM radio from a newer Subaru using a single-piece harness -- no crimping or soldering required! Price is $32 plus shipping. See post #1.
I also now have the small, 8-pin aux plug used on some new Subaru OEM radios. On some Forester OEM radio models, the radio's socket also includes two pins for a 5th-channel subwoofer output that you might want to play with. E-mail me for details.