I have a 2008 ram 2500 mega cab with the navugation stereo and the infinity 7 speaker system. I`m wanting to install a pioneer double din avh-4300dvd unit I removed from my wife`s tacoma and just replace the navigation unit for and and have the pioneer unit work with the infinity speakers and amp. I found info off of crutchfield , and with this interface part their site say`s this could be done. Has anyone done this if so who and what parts did you use. Down the road I will run all new wiring and add an even better head unit and replace all the speakers and add subs and multiple amps. Thanks for any and all input!!