I took the Hurricane back to the dealership last summer, they spent significant time stuffing, taping, sealing, and test driving. They got the noise reduced to where it was only barely audible (but still there) After all that they were still baffled as to the source. It still comes and goes according to wind and weather conditions but is now mostly ignorable and endurable. This summer I plan to pull some or all of the interior dash panels off and seal/insulate wherever possible or practical. Hoping to decrease general road, engine, and wind noise and maybe eliminate the buzzing in the process.
The panel I pulled off was the vertical fiberglass hood which gives access to the engine. With the hood removed the noise was totally gone at all speeds. Although I think that was due to its effect on air currents in the engine compartment and under the dash, not the hood itself
I like to travel, but I also like to get back home.