I just left Best Buy, there is a 139.00 cable setup that is just an fm transmitter that is installed in the rear of the factory radio. All you see is the port and a small on/off switch.
The guy at best buy said that even though it is an fm transmitter, there is no static. For the pathfinder installation and parts was going to be about 200 with tax.
The way I see it, might as well have a nice aftermarket stereo installed that includes an aux port.