factory radio

I have a 2008 grand touring with factory 6 disc changer 5.1 Bose Centerpoint. I would like to upgrade to factory navigation. Can it be done? Is the wiring harness in place? Thanks, Bill

Finally got around to posting a how to on this install. Don't think theres a complete right up on this yet so here goes. Im taking the system from my old 300zx. My main concern was to maintain the stock look inside the cabin and under the hood while having the ability to remove the box/amp...