I personally wont put that Nakamichi crap in my BMW, looks cheap. Your interest is to install a unit that has updated features such as GPS navigation, back up camera, DVD player, MP3 player, Bluetooth, telephone, etc... you cant get this without major modifications to your audio system. If your intent is to keep the factory look, upgrade to the MKIV navigation, BM53 radio with aux input, bmw mp3 CD changer, Bluetooth adapter, and wide screen display. I'm sure after you do the math you'll realize why some folks go the aftermarket route.
Big Boyz with Bad Toyz
Big Boyz with Bad Toyz.