i can tell you havent done any searching. there are quite a few articles on the web about the vortex generator. there is a nice youtube with a toyota corolla being tested at 43.5mph. one can CLEARLY see the airflow is straightened out over the rear windshield. and the corolla has a much steeper windshield. i would think this would result in slightly less noise, and a very small increase in mpg, esp at freeway speeds. i really dont care about looks, i would install anything that makes the car more efficient. a sunroof deflector makes using the sunroof way more pleasant. vent visors allow the windows to be open slightly, increasing airflow thru the car, and are excellent to dissipate heat when parked. i could care less what they look like, they work.
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