Audi A3 8V 1.6 tdi s line noise

A3_8VSline

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i have a like a whoosh air noise from 800-2100rpm on acceleration...slightly lacking power so have to 80% to get going, what can it be? There is kind of like an air leak noise on idle..best way to explain the noise is near end of plastic pipe that leads to the air-box

Any suggestions what it could be, i’ve been using diesel injector cleaner and more than 5 full tanks of shell v-power diesel now..still whoosh air noise and lacking power at lower revs but flys after 3000 especially at 3,4,5,6th gears