I have a 2018 3LT that has noticeable wind noise around the windshield and a-pillars. It is even worse in crosswinds. I had a 2008 Enclave, 2009 Traverse, and a 2014 Acadia and it is much more noticeable than all of those. The dealer thought they needed to replace the windshield , and it didn't help. Has anyone heard of a tsb or dealt with the same issue and found a solution. I have 5400 miles and otherwise love the vehicle. It gets about 7 mpg better than my old lambdas- even getting 30.7 mpg on a 100 mile back highway trip. One other thing-I had a squeaky steering wheel in cold weather and they replaced a bushing that fixed the noise.