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- 03' Silverado, 03' P5
Well, I finally set an appointment up with my dealership to get both problems taken care of/looked at. They knew the ECU reprogram existed for the cold start rattle, but I was the first one to call about it, as well as the roof rack noise. Anyways, I figured I'd put this thread out here, so I could remember to post the results of their effort next week. 
Yippie!!!!! No more rattle and Woooooooo on the highway. (I hope)

Yippie!!!!! No more rattle and Woooooooo on the highway. (I hope)