Just buy a 8.4 RA4, around $500 and then you can turn around and sell your RA3 for around $300. You also get HD radio and 3D maps.
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Where are you finding RA4's for $500?
I bought the NAV upgrade from factoryradioparts.com too for $389 too and I agree with the other poster.. it was probably a waste of money. The thing about the factory radio parts is that the map database is from 2013. Dodge would probably give at least the latest update which I think is 2014 or 2015, I can't remember.
I do know that I chatted with Chrysler about the upcoming map database and there is supposed to be a 2016 map pack coming out this December. So anyone wanting to get it from Chrysler with the $100 coupon.. I would wait until after the new maps come out or you are going to have to pay another $150 to update it.
Since mine is pretty much useless right now, I am going to be buying the new map pack and hopefully be able to even use the damn thing. But it will be the last update I buy. Wish we could just stream WAZE to the 8.4!!