I make calls with the top down at 70mph and with the top up....no problems for either and sometimes I'm talking to 84 yr old people with bad hearing !!! I crank up the volume a bit and it's fine.
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
'03 Z4 3.0i Sterling Grey (Hers)
'01 Z3 3.0i Sapphire Black, M sport package (Mine)
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