Hi, Shawn --
You are not the first person to ask a similar question on this BBS. I think I may be overlooking something about this whole idea, because I don't understand why anybody would want to keep their original head unit in addition to the empeg. With the empeg (at least from all the preliminary reports I have heard) you have a very high quality, attractive unit that will outperform in every regard whatever you currently have installed. Think of it as a better CD player with a built in 100 Disk changer and full instant random access to any track.
There are a few down sides, but I don't consider them serious. There's no AM radio (gee, I can't listen to Rush Limbaugh and G Gordon Liddy while I'm driving. BFD.) And you do have to purchase and install an external amplifier, but if you were heavily concerned with sound quality you would have done that already!
Don't think of the empeg as complicating your life by making you figure out all sorts of weird connections. Simplify - go with just the empeg, and you will find that you have greatly enhanced your music capabilities.
Good listening...
tanstaafl.
"There Ain't No Such Thing As A Free Lunch"
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"There Ain't No Such Thing As A Free Lunch"