Ah, that makes sense. My dad's company car (also a Lexus) had the same brand in it, though I suspect it's a later model. It looks like the toughest part would be to fit the empeg in there, since it looks proprietary.
You're right, though. That system is probably a lot more integrated, though as far as I can remember, the CD controls are in the nav portion.
I don't know, perhaps it isn't possible. I much prefer my nav system to that one anyway. The Kenwood loses its direction every time you start driving. And the only thing I lost when I switched out my stereo was the voice commands. Voice commands are awful.
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Matt