You can add it, but it is not plug-and-play. BMW only had the voice recognition pre-wiring for a couple model years-- I think they were 2001 and 2002. After that, they quit putting the VR pre-wiring in the cars. Fortunately, BMW has a SES voice recognition retrofit kit, part number 84.11-0 029 707, that you can buy and use to install the module.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input