Just a hunch... but I think this factory option is essentially the same as the current dealer installed iPod adaptor. There may be some added functionality for other USB players, but I doubt you could DIY this without at least having the dealer update the programming.
As a factory install, it is bound to be significantly cheaper, and might have some better integration. I'm looking forward to the full scoop on it, although JSpira has given us a nice head start.
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I think it is bad luck to be superstitious
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