Hello, I have just come into possession of a 2010 CX-9 Sport with a non-Bose radio. I'd like to purchase the oem navigation unit and install it. From the photos I've seen online there are a few more wire harness ports on the navigation head unit and only 2-3 on the standard radio. Do I need a special wire harness to upgrade or are the required harnesses sitting in the dash all ready? Could it be that easy?! Any other tips or tricks or installation help would be very appreciated thank you all!