"Yakima sells aerodynamic plastic pieces that achieve similar effect that comes naturally to the Whispbar..."
which ones are those?
Do you mean the little/short section of ovalized plastic that slips over the round tube?
Hmmm, my understanding is that it is purely to make a badly whistling rack more quiet but I don't think it will really make it more aerodynamic considering the chunky towers and all having also a great effect.
I would love to be persuaded differently as the Whyspbar ain't cheap...
Rescue / Throw Bags
1 Canoe/Kayak Trailer
EZ Launch™ Kayak & Canoe
Kayak Deck Gear Bags
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