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So far just changing the front spoiler into an air dam. I had it rite the first time when I tilted out the conveyor material at the bottom.
It worked really well but when I added side skirts I figured air dam and it dropped mpg 1.5its still that was 2 months later because I threw away the bracketts required to angle it forward at the bottom. Air dams work for some people but my sephia is pretty aero and it is just a big speed brake infront of the bumper now.
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