Wait... your 2010 base 3.8 came with nav? :dunno:
I'm willing to bet you have a 3.8 GT.. 18inch wheels, no Brembos, chrome whiskers on your fog surrounds, heated seats? (UNLESS your car is used and someone installed an aftermarket nav system on it)
I'm pretty sure you can swap seats with someone who has a base model (unless you have the brown leather, you'll have to swap all the seats)