Hey guy's I'm new here just got my z, I've been reading these forums for months now, and the wealth of information has been very helpful in my decisions. I have factory nav and the non bose radio, I'm planning on changing the hu and hooking up a 3 1/2" speaker to the nav voice output, I wanted to know if the nav has enough power to push this speaker to a level that can be heard while driving. Also has anybody out there tried using an fm modulator for the nav voice, Thanks for your help...