Any decent installer will be able to help you with the installation of the empeg, Crutchfield and other after-market suppliers may be able to help you also.
 Not _yet_. Depending on the HD size of the unit you order, you may not want your changer. I still have my in dash CD player which is nice to play CDs on the way home from the shops before I encode it and for the radio (the reception of the current radio is ordinary sorry guys). If you had the option, wouldn't you rather swap music selection on the empeg rather that the changer? It is easy to under estimate the change this player has on your listening habits!
 Cabling may be the only other issue. mounting the amps and figuring out the speaker system wiring maybe. but I don't know *anything* about the car
I What part of 'no' don't you understand?
Is it the 'N', or the 'Zero'?