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The dimpling that I saw on the VW was on the underside of the rocker panel, just behind the front wheels. It was made of plastic. I can't imagine how that this could stiffen anything other than the plastic rocker panel. ( "confused")
A while back, someone here posted some pictures of either a BMW or Audi that also had dimpling on the bottom of the car, as well as NACA ducting.
I looked at the underside of an LS430 but could not see the 'dimples' very well. They appear to also be on a plastic piece located around the engine cover ( " bellypan" )
Off topic : Used car lots are great for seeing things like this. No one will shoot you for snooping under their car. ( I also found out this way that the VW Passat has a beautifully designed engine cover complete with 3 or 4 NACA ducts. The new Fit has a smaller more sloppy version, but also has small NACA ducts at the rear or the cover as well.
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