Scott,
Does you car have the pop up wind deflector? Some Cali's do; some don't. I've read that the deflector lessens the Cali's wind noise when the roof is open. I wonder if a plastic deflector like you see on some sun roofs would have a positive effect. Is the sound wind noise, or does the canvas make a flapping noise? I've read about the noise issue with Cali roofs. They look worth to me, though. | 
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