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Looking at the photo you have up of your car, the sides look fairly effieceint for a factory car. Hyundais are known for being good cars, and they have come leaps and bounds in their designs. I would work on the front end, blocking off and diverting more air around to the sides of the car. Maybe a short duckbill spoiler to help the air seperate cleanly from the rear decklid. You should see some benefit from these mods. Maybe determine if there is anything you can do with the mirrors. They don't look efficeint as they could. The work so far does look good though.
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