yep...smells like a jet

I thought it happens just after I accelerate hard, but it happened to me sitting at a light in stop and go traffic. The first time it happened, I thought it was because the rear slider open and the wind was the right way, but like i said, found out later that there is basically no smell to the exhaust on these trucks. Maybe some sort of partial regen?

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2009 Ram 2500,QC, 6.7L, Auto-6, 4X4, Laramie
2006 Hummer H3, 3.5L, Adventure PKG
1986 GMC Sierra Classic, 5.7L