Just an update. I messed up the paypall payment so I did not receive the adapter. I re-ordered it just now and got all the confirmation. I will plug this sucker in as soon as it arrives and let everyone know if it worked.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New