Sherpa Antero rack test drive -
Without the box the is a little wind noise (to be expected).
With the SportRack Xl box in place there is a definite rumble. It may have been there on the Suburban too but I didn't notice it because it was farther away from the driver's seat.
I opened the sun roof at 65 and there was definitely some air noise coming from the front of the box as it was just aft of the sunroof.
It wasn't that bad and I could't hear it with the music turned up.
I'm looking at installing some slot covers that slide into the cross bar openings, might reduce noise and will keep the channels clear-
Amazon.com
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1998 SR5 - 5 speed w/ 4.30 E-locker
My 1998 SR5 Build Thread