The 2006 FEW Owners Manual comes with a Audio Supplement (6M6J-19A285-AA) that details the operation of "Premium Satellite Compatible AM/FM Stero/Cassette/Single CD/MP3 (if equipped)"

The first printing of this document was in September 2005. Although NAV/Energy display would not be an option, you should be able to order an FEH with this audio system.