ok I was wondering, I wanta make a pi for my car with xbmc, but was thinking if I could also use the pi's fm transmitter trick with it. this would alow me to transmit to FM radio without another adapter or such... anyone think about this or try it?

I have had a b unit and have retropie on it. I wnated to just put the sd card into the B+ but the usbs arent working with the B image. is there a simple fix for this to activate the USBs or do I have to rebuild the entire thing again from scratch. Id love to just figure out a quick fiz for this... a...