like some others have said, it's the air filter. i recently borrowed my friends cone filter setup (filter, harness plugin, intake pipe), a simple 5 minute swap. the spooling was much more audible as well as a slight BOV "ppshh".

 

Intake and air filter. I used k&n but it was blocking all the whistle noise.
Now I have ebay filter and sound way way too loud.
But i dont get whistle sound when my car is parked. Only when I boost in street.
Guessing turbo dont spool high enough parked?

 

I can hear it clearly with a Works drop-in air filter but not with the stock air filter.

 

Turbo isn't spooled at all when you're parked.

 

how come that wrx makes whistle sound when its parked?

 

Because it's revving up.

 

I hear my turbo spooling all the time when driving, Drop in filter, and TBE, but should still hear it stock

 

this thread makes my head hurt... makes me glad my car is debadged... and i cant wait to take off my wing... an entire thread about "woooowoooooo"

 

run a cut out if you want some sound otherwise who cares if your car makes the noise youll still outperform the other car anyways

 

Forget what they said up there ^ . YoUz NeEdZZZZ Diz

http://cgi.ebay.com/ebaymotors/Get-H...spagenameZWDVW

or

http://www.makesyouthink.com/turbosound/


ok.. just thought I'd throw some humor in there.

 

I put a down pipe and hollowed my stock cat and I hear the whistle. I thought something was messed up.

 

As someone else mentioned, if you run open header, or an exhaust cutout, you will hear that sound.