Does your engine sound like it's asthmatic on light throttle openings ?
If "Yes" take a look at the top intercooler hose for leaks / holed.
Checks to the n/s/f chassis rail by the headlamp unit rear section and the intercooler elbow joint. If these areas are splattered with oily patches there is clearly a boost leak and the likely cause of smoking.
The PCV vlave blocked will cause similar smoking issues.
Has there been a significant drop in engine willingness / performance ?
Is there any unusual whistling noises from the engine during power delivery ?
Has your car got a tuning box fitted to it, as some engines don't get on very well with them if fuel rail pressures are increased.
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