Factory radio will be very expensive. There are already aftermarket solutions that have gps and everything, but they are offshore products and im waiting for a review. It's a total replacement with a 8" touchscreen and plugs into the stock data bus so it controls the ac and everything and works with sync. They r as cheap as $350 but I'm not gonna be the first to try. I think shortly we will have lots of solutions. But i want a dedicated preamp out as well. I don't have a mustang yet, but if i do i plan at least new front speakers and a.sub. how does it sound now? If you turn down bass a notch below center, will it play loud? Wish i could hear one.