I dont think not much of a difference, I have had it on and off couple of time, the cross bars if you notice are aerodynamiclly shaped ( aircraft wing ) , so that they can have the wind deflected at minimum resistance. The noise is higher when you have cross winds than head wind.
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LS400-1994/GX470-2004(KDSS) (HIS)
LS460(2007) HERS
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 Ability is what you're capable of doing...
 Motivation determines what you do...
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