[s-cars] whistle/whoosh

[Rokas Reipa]

Hey everyone. Recently, the whistle/whoosh coming from the engine(it's been
there since I bought the car) has intensified to the point of being
annoying. It manifests itself during acceration, above 2500rpm and is the
loudest in 2nd and 3rd gear. I don't mind a little whooshing but it's
getting a bit excessive. Is my bypass valve leaking or could it be something
else? Just thought I'd check before starting to buy and replace random
parts. Thanks,

Rokas
95.5 S6