Up for sale is a untested BMW E38 E39 E46 X3 X5 Z4 Sirius Satellite Tuner.  If you vehicle is prewired or currently has a CD Changer installed then installation is a simple plug and play.  If your vehicle is not wired you will need to add the CD Changer Connection Cable which connects to your wiring harness.  If you are looking add Sirius Radio to your existing CD Changer you will need a Sirius Slave Cable (part #84110150526).  Please go to bimmernav.com for detail information on doing a Sirius upgrade.