Turbo noise?

[Dan_Austin]

Background- Recovered theft auction purchase with unknown mods from previous owner(s)
Normal wear and tear, hack-jobs appear to be limited to non-existent.

Except a cornball CAI consisting of a flex elbow and crap filter, also a manual boost controller
plumbed inline with the stock boost controller valve. All factory air intake parts MIA.

Builds boost normally, but makes a 'whooshing' sound when lifting off. I have another turbo
car without BOV and I know what back surge/flutter sounds like. A couple threads suggest
the sounds is normal and only noticeable with short CAI.

Would I be on a wild goose chase to be looking into the possibility of a partially stuck open
EGR valve? The truck idles slightly rough, but not enough to worry me, so not sure where
to look...

[Aeroking]

A large pod filter that is close to the compressor inlet will magnify the compressor sounds. So the turbo should be noticeably louder.

[Static]

Sounds like youre hearing the wastegate if it happens when you let off.