I have a 2003 X5 4.6 w/ nav, that is built before the date in which they can support the satellite radio, but want to get the feature working. I have access to a 2005 4.4 w/ nav, can I just swap radio modules between the cars? I need to know if there are any differences between the 2003 & 2005 modules, and if there is any programming necessary, or if it is just a plug and play operation. Any input is appreciated.