bump - I have the thunderbolt and am looking to do a similar setup! was that mount a "Car Mount" or a normal belt clip mount that you added a magnet to???

I have been unable to find any low profile mounts like that for in a car? only big a$$ window cup mounts and stuff...

 

so all the sound comes out the car speakers? What about the mic when the phone rings.. are u able just to answer it and start speaking?