Al Kohalic

Oh I bet a "nice puff" would not be the words to describe what that Cummins does. More like a choking thick fog of sweet black smoke diesel goodness if it is tuned.

Op, the black stuff on the tail pipe is normal. I have had a few people ask if my truck was a diesel because of it. I hardly clean my truck for months at a time so you can imagine how much black carbon will build on there after a while.