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1. As far as I know, audio is only via Aux in the arm rest. You can't send audio via the USB. Get the higher end models with DSP, sound is pretty decent (but my hearing may be a bit damaged from years of V8 straight pipe abuse lol)
2. Absolutely use a GPS splitter so you can use the stock GPS antenna. I do this. GPS lock is much much faster than using the provided GPS antenna cable.
3. No idea here.
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