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335i issues. Vacuum leak?

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Good evening Gents,

I have some strange Issues with my 335.
It's a N54.
I have been running intakes, downpipes and ecu tune for more than a month.

On the way down to durban on Friday afternoon we hit roadworks, after idling for 2 minutes it started smoking heavily. After pulling off and boosting once all smoke gone. Nothing on acceleration or deceleration thereafter.
Got to durban and the car felt down on power and hesitating in the upper rpm.
The car is also dumping louder than usual.
The vehicle doesn't smoke when cold.
It only occurs when hot and when the car has been idling for 2 minutes.

Any advice guys?
Thanks in advance.

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