Hey Guys:
It looks like I will be installing an aftermarket headunit (Alpine 7887) with the Metra 70-7551 to keep my bose audio.
I also have OEM Navigation ('03 G35c).
Will I lose the Navigation voice? Is anything else required to keep the Navigation voice?

Also, will I lose the steering wheel controls? IF so, how can I keep them?

Thanks!

 

I am not sure what wire you need to convert to an RCA on an 03, but I have NAV voice working on my 07. You will lose the voice with out adding a AUX input. Do a search on threads I started, I did a tutorial.