Unless you just need a new key - I added the SmartTop controller since my car was ONE MONTH too old to get that function - I actually like the SmartTop better. You can put the windows up/down, top up/down with the key - start the top up and pull the key and walk off and it finishes. Also don't have to be dead stop to drop raise the top. One of the best mods I installed.
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2015 X5 XDrive 35i - 2004 Z4 3.0 Sport
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