Radio Swap 92 Ls400

[ducatist4]

Been searching this site for information on a radio swap for my 92 ls and not finding what I want.

I have a AM FM CAS. I want to install a stock lexus AM FM CAS with CD button. I asume that I will need a cd changer to go in the trunk. My question is if I find a changer and "head unit" will it plug and play? Will the new wiring plug into existing? I realize that I will have to run wire to the trunk for the changer. I have a pioneer radio. Is a nakamichi compatiable?

Thanks