Are you thinking of changing it? The OEM mic picks up way too much road noise. People calling you in the car can't hear you talk when car is moving.
But, if someone figures out
how to connect a good noise canceling mic like the one in the plantronics voyager ear pieces it would be awesome. Callers can't tell if I'm in the car when I use it! I knock it has 3 mics but there is probably some software needed too.