I think you are referring to a blow off valve woosh. Your car does not have that.

 

lol @ the cartoon.

I'm pretty decently well versed with the 1.8T passat and I know BOV's arent good for our cars (I actually have a new DV coming in today). What I am new to is the Turbo (how it sounds, what it's supposed to sound like under high rpms, vacuum leaks that effect the turbo...it's my first turbo car as I used to run with JDM such as S2000 N/A's and big V8's). My car is very high mileage with 180k and from judging by the hoses and clamps, everything is still stock (All hose clamps still have the factory one-time use clamps on them) and i have no clue if what happens in my car is normal or if there a issue such as vacuum leaks or anything since, i dont know what it's supposed to sound like or do. if that makes sense..?

I do not have a boost gauge set up yet, but i do feel a very light kick after the turbo makes that whine type noise.

 

No "whoosh" on regular old deceleration (car in gear, in motion, foot off gas pedal). It will sound like any NA car.

If you installed a BOV, it would make a "whoosh" when the throttle snaps shut, like during a shift, when you are in boost/accelerating.

 

On a good day, with a good ear, you'll hear a slight whine - if your alternator doesn't drown it out. No whoosh, ever.

 

I have an APR R1 valve, it makes a somewhat similar noise to a blow off valve under certain conditions. With a stock setup the only "woosh" noise I can think of is turbo spool which happens right around 3k rpm and up.

 

On a hot summer day with the AC running, the only wooosh sound I hear is the belt driven fan from a start. It's fairly substantial.

 

You often hear a whoosh sound in a 1.8 NA.
That's the other cars passing you.