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I recently had a faulty boost pressure control valve replaced as i had the error code P2263 on my Citroen DS3 thp155 , before i had this replaced i have an open induction filter from which i used to be able to hear the air being drawn(sucked) in , now that the boost pressure valve has been fitted i can no longer hear this whoosh ? the turbo has become almost silent ? So i bought a new diverter valve in case this was the issue but its not ? The turbo is kicking in as i tested it and its pulling 8psi so i presume the turbo is working but the whoosh sound has completely disappeared and i cannot hear the air being drawn through the open filter as i could before ? Does anyone have any idea why this could be ? I use only citroen standard parts (no 3rd party). Could the MAF sensor now be faulty ? The car is showing no errors i just cannot hear the whoosh through my induction kit anymore ? The car is not mapped .. Any help would be awesome .. Thanks in advance