My personal experience so far is that the sound quality on the phone is excellent w/ the top up and good with top down up to 45-50 mph. Probably wouldn't plan business calls top down if I could help it but you could if you had to.
Wind deflector probably would help in this regard (?), but I don't have one so can't compare.
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2011 E89 Z4 M Sport (Euro Delivery, Performance Center redelivery), Extended Nappa leather, Eisenmann Sport Exhaust
2003 E46 325i Touring
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