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Update: Had nothing to do w mudflaps. It was the Ford hood deflector that was installed about a week before the mud flaps. Just coincidence that whistle was noticed same day as mud flap install.

Did all four. Seems to be coming from the front area. Hard to identify if it’s coming directly from the guards but wasn’t hearing it before install.

New 2 door Black Diamond owner experiencing a whistle noise at highway speeds after installing IAG I line mud flaps. (No similar noise prior to install) Anyone else w issue? Any advice? Any input appreciated. If Im missing another thread already on this topic please LMK.