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      07-11-2012, 06:45 PM   #2
United Kingdom

Drives: Sapphire Black E90 325D
Join Date: Sep 2011
Location: Hampshire

Posts: 90
iTrader: (-1)

Sounds to me as if you have a small boost leak! Had it happen in my Transit Connect and it rounds very similar. Take it to a local garage and get them to put a tightness test on the pressurised part of your intake.