Took it out again this past Sunday and I didn't hear anything. I mean, it might still be there but it's really quiet and I might be hearing nothing. To be honest, it wasn't particularly loud to begin with and I couldn't ever feel it. I'll be looking to use the truck again this week so I'll continue evaluating.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim