We have a 1977 Bus with a sunroof. It gets pretty loud with the roof all
the way open at highway speeds, but not as loud as when the windows are
open. We have found, however, that the ventilation:noise ratio is best with
the roof open about about a foot and the vent open.
Eric K. Engelhard   erice@nature.berkeley.edu                
Insect Pathologist/Brewer/Biker/1977 VW Bus 
(Lee McKenna proposed: "Dead Bug-Juice Peddler")
251 Koshland Hall
UC Berkeley
Berkeley, CA  94720                 __o
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                                ...O/ O...