I agree. The MKIV updates will probably continue until the current body styles of the Z4 and X3 are out of production. We probalby have two to three more years of updates.

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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