Roofbars for Citroen Xsara Picasso

Can anyone in this forum recommend a roofbar/roofbox combination for the Picasso which doesn't cause excess wind noise when driving ?
Last summer I bought some cheapish roofbars from the local motor shop and borrowed a friend's Thule roofbox, but everytime the car gets over 45mph the whistling gets so loud you can't hear the radio. It seems to be the bars rather than the box that's causing the problem, because the whistling comes even without the box fitted to the car.
Many thanks
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