I have noticed a difference in the reduction of wind noise. The nice thing about it is that when you have the flap tilted straight up and down, you get a nice redirection of airflow into the cabin. Also, the deflector fits the car very nicely. Even if you forget to tilt the flap back into it's original position and you close the sunroof, the sunroof does not hit the flap. Best of all, it comes right off with the twist of two nuts for cleaning. Nice product.
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