I am currently using an MHL adapter for my phone to run mirrorlink on my Pioneer headunit. All my cables run up through my center console and the short cord coming from the MHL is too much of a pain to work with. I found a company that will build me a custom cable as long as I provide them the specifications. I'm thinking of a specific retractable micro USB cable (female to male) but I want to know if the output cable on the MHL adapter is special in any way.
Here is the cable I'm referring to. If this is just a normal micro USB, my idea will work. If it's a special pin configuration to support the MHL data, I don't think the cable company will have access to that kind of hardware