Induction "flutter"

[Aweful_Truth]

Since I got the neuspeed induction kit it's whistled and then hissed when changing gear or letting off the throttle but that last two days it's stopped hissing and now makes a sort of fluttering noise. Is there a reason it's suddenly changed. Nothing has been changed in the engine bay for a long while either :/

[stealthwolf]

Is the filter clean?

[Sammy]

Diverter valve?

[webby888]

yeah mine flutters everynow and again too, pretty much always after iv been for an enthusiastic drive

[Aweful_Truth]

cool thanks :) ill give the filter a clean as well

[MitchGTI]

its a normal thing dont worry, my s3 and gti both did the same, i kinda liked it 

[john87]

if it flutters more often than not, and the car is on standard map, then you could have a stuck recirculation valve. My car does it with the TWINtake kit fitted, but only flutters if I release and re-apply the gas in quick succession...the rest of the time its just 'ptssshhhhhh' 

[Sammy]

if it flutters more often than not, and the car is on standard map, then you could have a stuck recirculation valve. My car does it with the TWINtake kit fitted, but only flutters if I release and re-apply the gas in quick succession...the rest of the time its just 'ptssshhhhhh' 

Is your car manual or DSG?

[spankydan]

Depends what you have been doing if you have built up a lot of pressure by being on the throttle for a while it would tsssh rather than a flutter (technical engineering terms here ).