On all my previous cars when I'd wipe my tips I'd have at least a bit of soot on them. So far I've not had ANY when I wipe the tips on my Bullitt. I'm amazed how clean they have been.
I had a '15 GT Preimuim and then moved to a '17 Camaro 2SS before trading "up" to my Bullitt. I agree, the exhaust tips on my Bullitt don't really seem to accumulate the same quantity of hydrocarbons as chromed exhaust tips.