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PS, you need a vag-com to adjust the injection quanity (IQ).

Basically, there is a value called injection quanitity. The higher number means less fuel. Even cars straight from the factory can have quite a variance in IQ. By raising this value, you can reduce fueling which reduces power and smoke. If you can find a vag com the owner should know how to do this.
 

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The problem in this thread may be related to overfueling, your car may be the same. Even a small change in fueling can greatly increase or reduce the noticable smoke.
A small change in your right foot can too. I've found that smoke is highly subjective. A small grey cloud is normal. A noticable black cloud might be overfueling by a tad or it mightbe normal. If the headlights behind you disappear by 75%, then you are definitely overfueling.
 
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