[QUOTE=jphughan;12844924]If you use a Y-cable, that may be true (although I think those cars use analog audio through the snap-in too, but I'm not sure). But if your car can pull audio using just the normal white USB cable, then sound quality should be identical since it'd be digital audio in either case.
I hear you and it would make sense, had the music through USB and with the snap-in I could tell the difference immediately, it was such a huge difference, most people may not believe me that is the case, but I experienced it and I guess that is what really matters.
Still, if I find time, I will try to do it again and let you know.