PhinX404

i have an A4 2.0T Quattro. I have 56,000kms on the car. also have APR Stage 1, Carbonio intake done. Now i have noticed from time to time that i have a little black cloud behind me when i punch the gas. It did this before i got the car chipped. any ideas one what i could be? i have not thrown any codes at all. just not right to be doing that when i drive it a little more rough. thought id ask around as im taking it on monday. i will set it back to stock and lock it out before taking in.

wanthema

sport mode all the time? LOL