This has me thinking, cause I get a pretty loud noise similar to what you are describing at highway speeds and I do not have the marker lights either. I'm actually thinking that noise is coming from the drivers side hood vent. I think air is going through that vent in such a way that it's making a howling noise. i'm not so sure it's the A-pillars. Thoughts?
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2008 Hummer H3 Alpha Adventure. Graphite Gray Metallic.
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