Dump valve noise, no dump valve...

As above guys. Recently started getting a hiss when backing off boost, (louder if more boost).. never really noticed it before. Seems to drive ok, reaches target boost. Hoses are in good nick and in place.

Any ideas? Working on possibly the recirc valve failing but seems to run ok. Been more noticeable after a hard drive the other day

Thanks

That's the recirc working normally, nothing to worry about.

Ok great. Any ideas why it is louder than before?? Definitely holds vacuum in the cbv as Iv tested it. Maybe it wasn't working quite right before and has now started working properly lol