Quote:
Originally Posted by Joggernot
The person was very proud of the new after-market add on. Not an OEM piece. Yes, it was on a Hyundai Genesis, but the year wasn't given.
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That's critical information. Contemporary KIA/ Hyundai products are already at the lower end of the production car drag spectrum, and I couldn't imagine why Luc Donckerwolke would have put that device on a car.
I'd bet a cup of coffee and a donut that the roof spoiler has degraded the aerodynamic efficiency and stability.