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Old 06-10-2016, 06:44 AM   #10
guybo
Huge E85 fan!
 
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sounds like a trim piece being buffeted by the wind since it happens over 65. Have a friend ride next to you and watch that corner of the car at speed on the highway, see if he can see anything flapping around. Could be the undertray or valance too- check that they are tight.
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