I sell and install aftermarket electronics to car dealerships in my area. The wireless FM transmitters are in general CRAP. You will hear it but it will be muddy and full of static at times. If you want to run it through your factory radio get a WIRED fm modulator. One that connects behind the radio and feeds the signal directly into the radio antenna jack. They have line level inputs on them so you can add a cord with your headphone jack on it and have it come out in the glove box or center console.
I got one of these off Ebay last year and love it. Its not cheap but it works fantastic with this phone. I also run my back up camera and video through it (only when Im parked of course
) I have it mounted where my rear view mirror would normally be.
http://www.alpine-canada.com/US-en/p...del=TME-M740BT