Since you have a 2008 you will need something like this:
http://alekshop.com/products/multime...2006_2008_bmws
If it was a 2010 (maybe 2009) + it could be enabled through coding.
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If you will be purchasing ANY AT&T services online or in store could you mention that you were referred by me? My Employee Referral ID is eo4489. This would be a great help and it costs you nothing, thank you!