roof

The Cross rails on 2017 seem to cause a lot of turbulence and thus noise at high speeds. Was not a problem on earlier model. Any suggestions to reduce noise?

I have a problem with the built in sunroof wind deflector making a buzzing sound. It's only when the roof is closed and at 35mph and up. I tried putting a little grease in slots on the sides where the aluminum deflector is pushed down, but that only worked for a day or two. Any suggestions...

OK, we're going against the grain here... we own a 2008 Tahoe Hybrid. Great car, and would be better if we had a roof rack! The factory did not install (and will not install) a roof rack rail system. Anyone have a solution to this? I've already tried buying the factory rails, without any luck.