I used Yakima round bars on my truck cap to haul sea kayaks for years and never heard them (even with the kayaks mounted). Then again they were behind me on the back of the truck. I did however notice a fuel penalty and began removing them when not in use. I also saw a person I knew from work come into the parking garage and take his rack and front bike wheel off on an overhead sign. Good thing the frame was in the back of the car.
I see lots of Yakima racks and parts of racks on local social media and Craigslist for sale, though, and many are in near new condition and cheap enough that you can buy the whole setup and keep what you need.