The MOST bus is used for additional devices like TCU and such, but I think the NBT has it internal as well as Sirius, DVD player, etc. The CD/DVD changer that would normally be connected separately would be on the MOST bus as well as the TOP-HIFI amplifier, but you will likely be using the wires on the quadlock for audio channels, so you won't need that either. If you were retrofitting the Logic7 amp from the newer cars, you would hook that up using MOST. Also, normally, you would have a rearview camera connected over the MOST bus (I think), but with the carsystems NBT-to-IBUS adapter that it looks like you have you can connect any aftermarket camera. Basically, you shouldn't need anything plugged into the MOST bus to make the system work. What you will need is a cable that goes from the ping star-quad cable on the left of the picture to the monitor that is long enough to reach from the trunk area to the dash. What some people have done in the X5 is buy the E70 USB cable (I provided a part number for it above) and shave off the key tabs around the connector and plug it into the monitor connector. Then you'll need to figure out how to run the two power wires that are to the right of the round connector. They do not need to be in side the quad-star cable and just need to be basic 2 conductor wire.Read this thread if you need help: http://www.bimmerfest.com/forums/sho...d.php?t=799458