Please help me. Installing siriurs add on tuner to 06 pathy

[familypathfinder]

I have researched and found some conflicting stories. My wife and I just got a 06 Pathfinder SE with Bose 6disc. We just ordered the 999U9-AS006 unit for it. From the PDF I found it appears to get installed in the rear truck jack tool area? http://www.infiniti-parts.com/...6.pdf

Is there a factory prewired harness there?Do I need to buy a harness?All I think I need is the tuner unit, mounting bracket, and antenna. Is this right?

Also had a question about adding a PAC AAI-NIS2. So I can a aux jack for my wifes mp3 player.

Has anyone done both or either of these installs?Any issues?Things to watch for?

Looking at adding the nav compartment for the garmin also. She currently has a Nuvi 200 will the fit in the bracket?

Replacing tires with stock any suggestions?

Thanks again