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The T-handle wrench should loosen the clamps holding the crossbar to the frame. (You need the plastic keys to remove the cover on all four sides.)...
Yes, you'll be amazed how much quieter it is.
Yes, it is aero shaped. It tapers toward the trailing edge. I may try add some additional padding to see if changing the air flow quiets it down.
I installed the stock crossbars too, and yes, they're pretty loud. I took them off after one day, and will only be putting them back on when I...