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I've pulled them off the Cayenne, no idea if aerodynamics plays a roll in gas mileage but with the truck you couldn't tell unless is was an enormous difference it burns so much gas. BMW still has it because they made a nice trap door for easy oil changes.
I think they are more than just making the underside of the car look nice and probably do effect mileage a little with a cleaner air stream under the car.
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Tru6 Restoration & Design
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