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Gun powder smell coming from exhaust

Have just over 1000 mi on my 2013 Boss and getting a burnt gun powder like odor coming from the exhaust. Anyone else notice this and could it be the cats still breaking in?
boss tends to run fat not lean so probably just excess unburned fuel after you get on it, especially if you run the red key
I got around 470 miles on mine and the break in smell is almost gone. Its not bad compared to alot of other cars... Mercedes Benzs smell heavily of burning chemicals and Camaros smell like burning metal.

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