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If you're hardcore set on digital... remember, USB is digital. Instead of mounting the USB soundcard by the PC and running the audio cables up to the front of the car to the HU... run the USB cable up to the front, and mount the soundcard somewhere close to the HU. That way, you can use very short audio cables, so there's less chance of signal interference.
However, I think this is kinda overkill. As long as you use shielded RCA cables, and run them on the opposite side of the car from the power cables, you shouldn't have any problem at all, really.
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