I just purchased a 2011 Vert. I love my car!!! It has everything I want except for two things... that low growl that used to wake up the neighbors when I first started it up in the morning and NAV

I was wondering...

Is it possible to add the stock nav to it? It seems to have all the bells and whistles I'm looking for... nav, dvd, bluetooth, touch screen.
About how much would this cost and is this something that the dealership would or should do?
Is the stock nav any good? Do i really want to do this or would it be better to get something after market?
If i go after market would it screw up my warranty?
What are good aftermarket nav units out there? If you have links please post them.

I'm new to posting so if i have posted in the wrong area please let me know. Also any links to products or information would be greatly appreciated.



Thank you,

Steve