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Cross bar creates wind noise on the highway. Unless you need them, I would not put them on. I took off the cross bars on my last 3 cars because I think most cars looks better without them. Also, it easier to clean the snow off the roof of the car without them.
We just picked up a new 2011 RX350 and it came with the cross bars installed. I think it adds a little contrast to the roof and I really do not hear any noise from it plus you never know when you just might need to throw something on top to haul home.
Our RX came with them and I can't hear any wind noise. I'll just leave them on, they don't affect the looks one way or the other, imo. Maybe with a lighter colored car it might look a bit different, but with Black Sapphire they don't even show up.