Originally Posted by SuperGreg

You need the ULF module, the BT antenna and antenna cable, a microphone if you don't already have one, and the ULF interface cable. You can't do anything without this custom made interface cable that adapts the DB25 plug you currently have in your X to fit the connection on the module. In addition, you will also need the eject box and snap-in adapter if you want to mount your phone under the armrest. I would also strongly suggest that you also get the OEM ULF mounting bracket to achieve a stealth install.