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I did the same setup with the kenwood. I purchased it from crutchfield with the cables and something called maestro which allowed me to keep Ford Snyc. It was a easy install 95 percent of it plugged it in the existing ford harness. The only thing I did, that was not on the instruction was to hook the "parking break" wire to ground so I could use navigation while in motion. The install took my about 2 hours, with one beer.
I have the factory NAV on the V10 King Ranch and I don't use it. I think it looks nicer then the Kenwood. Most of the time I use my cell phone which does keep the maps loaded after the navigation starts. Garmin does make a fine GPS.
I had no choice but to pass since I bought my XL off the lot with the cheapy radio....no matter anyhow, planned on getting a Pioneer double din and don't regret it for a second.
Nav is dead nuts, silly accurate and the tunes sound good as well