I also ordered seals for the front doors to isolate the sound coming from the tires...
See this post/thread about sound deadening:
https://f87.bimmerpost.com/forums/sh...&postcount=123
https://www.2addicts.com/forums/show...34&postcount=1
Since the tires are rolling outside the fender area (-2,4 camber and 10 mm spacers), I think it's not a bad idea to seal the area between the fender and the doors...
Simon