On my Kenwood Hu I have in my Jeep there is a built in USB port that I play my music through from a flash drive and I want the same for my 04 mustang BUT I want to keep the stock radio. I know so many of you hate on the stock HU but I like the factory look and it works well for me for the most part.. Is there a way to wire in a USB port so the raido can play through the AUX portion of the radio??