Andy: Thanks for the input. I do have an after market high tech ski rack and basket on top but I have had that up there for quite some time and this noise is new. However I did replace my sunroof gaskets last fall (that was a miserable job)and have just started using it again. I will check it for proper sealing. I would be amazed if this noise turned out to be wind because it fills the car and sounds mechanical. Thanks, DW