All my hot damn tunes puff a little when you get into it. But all of them clear quite fast. On another note.....I switched to the S2H trans program today and I think I like it best. It doesnt slam into TQ locked as early as the S2M. It seems to do it at the right time, all the time.Last night I painted up my dash mount and also updated to the .28 newest update as well as the hot damn 300 and the Trans tune (S2M). Haven't really got on it to hard but I did notice that with the 300 tune in hot the black puff was gone pulling away from a stop light. With the factory loaded tunes on hot I'd get a puff of black smoke which I'd rather not have. I'm okay with it puffing black at the moment I romp on it but want it to clear up pretty good.