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a buddy of mine was driving behind me today and i was going up a small hill on side streets and i decided to get on it. and when i taked to him after that he said my truck blew some black smoke. the only thing done to it is a 4" rbp exhaust, with the stock cat.. 07 f250 6.0
just as cheezit said its normal on any diesel. its just the nature of the beast. a lot of people really like to black smoke rice bunners. me im on the fence on it. I can barrel out some smoke when I want to but not sure if its what I want to do. I own a graphics company and I made a sticker for a guy not to long ago that said "if it dont blow black take it back"
It will smoke a lot with certain tunes, no smoke on my tow tune but street and mid power smoke a lot. I could get it to smoke stock to though just playing around with the throttle, gettin in it, then out then in again real quick would give me small puffs