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MY08 cabrio MY09 Brabus MY21 Bolt
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I have found what causes the loud wind noise on the highway!
Could be a GPS antenna?
Put the strip back on, wind noise gone.>:D
Is NOT a GPS antenna!

It IS an OEM Air Deflector (BAFFLE DRAFT DEFLECTOR) - smart (452-774-01-65) used only on the cabrio and will make loud noise @ highway speeds if it is not squared up (at an angle) with the tridion or missing.

Physics is our friend, Kane @ Evilution.com has this explanation and pictures too - "The Coanda effect is where airflow attaches itself to a nearby surface and will follow that surface even if it curves away from the direction of the original flow."

Was your deflector missing and you replaced it (how was it affixed, double stick?) or . . .
 

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Lads and Gens,

I have found what causes the loud wind noise on the highway!
Could be a GPS antenna?
Put the strip back on, wind noise gone.<img src="http://smartcarofamerica.com/forums/images/SmartCarOfAmerica/smilies/tango_face_devil.png" border="0" alt="" title="Devil" class="inlineimg" />
I was wondering what that little device is for , it’s also on our 453 cabrio . It won’t be removed .
 
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