I have a Z130Bt unit in the car. Had the cable from the unit connecting to my iPhone 3GS. Worked great. I now have an iPhone 4S with a Boost Case on it. Extra battery and case all in one. Problem is it is charged with a micro usb cable. What I'm wondering is, is there a cable that would connect to the iPhone cable from the Z130 and convert to micro usb? I assume that would only handle power so I guess I would have to also have it split off to the line out connection on the phone. Does anyone know if there is a cable like this and whether or not it would work? I really don't want to take off th