I agree with the above. You will need the amp, speakers, wiring harnesses and so on people have asked before and realized it is not worth the time or effort. I agree with them.
The reason I linked to nav threads is because they would need the bose system as well in order to do the upgrade.
OEM NAV for my 40th?
Possible to purchase OEM Nav 3rd party?
Can I upgrade my Base headunit with the Touring's headunit?
Is there any way to put an OEM nav in a base Z?