See discussion about aftermarket microphones
here.
If you can find this, the Kenwood KNA-VC300 microphone has the correct 5-pin plug needed. I'll bet the mic works without any modification. This part does include a push-to-talk (or 'start voice recognition') switch. I don't know if the Impreza/Forester Navi will do anything with that (though the OEM mic does include a 2-pin socket wired to the same pins on the 5-pin plug as the VC300's pushbutton).
Picture on Crutchfield's site (item discontinued):

(click thumbnail for larger version)
Kenwood's installation manual:
http://www.kenwoodusa.com/UserFiles/.../KNA-VC300.pdf
Subaru's installation instructions for the 2008 OEM mic kit (P/N H0018FG300).
These kinds of 2-wire mics will
not work for the Subaru 2011 OEM Kenwood Navi (and the 2008-2010 Navi HUs will not work with the 2011 Impreza and Forester OEM mics).
Quote:
Originally Posted by bobaru
What did you use for the connector? A DB9 or Serial? What part at Radio Shack?
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I think he got the crimp-style DB-9 female for the pins, Catalog #: 276-1428
The pins look like this:

(click thumbnail for larger version)