I have the Nismo w. the R 6 disc set up when I bought it as well. U can buy a wire(cost like 10 bucks from Advanced auto) and it connect from the aux plug into the head phone output on your ipod. Once u mount your garmin in the space above the radio have a hole drilled out b4 u mount it. Then you can feed the wire threw, run it down to your fuse box and splice it in. That way whenever the vehicle is on it has constant power. Thats what i had done anyway.