[James_G0540i]

These Thule Wingbars are the same ones I used for my 2015 X5 F15, its a 5-10min job, perfect fit.

Went for a spin, and found they do whistle, but only above 80kph (50mph) and its very subtle.

I have an alternative theory as why people are getting different whistling. I think its the curvature of the X5 G05 roof and where you place the rack. If you place them too far back, the wing is angled slightly upwards (not horizontal to travel), so I think it might cause some whistle.

I placed mine around 590mm from the front, and separated them by 750mm, and I got very moderate whistling.
On the weekend, I'm going to try experimenting with the positioning, including moving it forward to 500...even 450mm from the front, and see what difference it makes, I'll keep you posted.