My question is a bit strange. I just have swapped my actuator to one has weaker spring, but my air intake sound changed a lot. It whistles very loud when boost arrives (not the BOV i guess, because the BOV has been not changed).
Also i hear a bit sharp (metallic like) sound as well this time.
Normal sound when there is no boost.

Here is a photo about the new actuator (taken from a Saab)... Turbo is T3/T4B:

 

how did you run your intercooler piping, i see it there and was wondeirng how it got to the IC.
sorry to ----- your thread

 

As you see on the photo the charge pipe is going right, it makes an U turn and coming back to the IC in bumper. Or did you mean else with asking "how"?

 

Well I hope you hooked the actuator up before you took it for a test drive.
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does it go under the crossmember then the 180 bend to the ic? what ic do you have

 

Sure, it was put on before testdrive

Any ideas for the sound?

Mahcivic! Custom made IC.

 

what crossmember? thats a 92-95 civic in that pic

 

Ghettoturbo! That nipple/port on the compressor is sealed, not in use.

Is there any chance that any metal part could stuck between compressor or turbine? Though i guess in this case i'd hear that metallic sound all the time.

And the car is a '99 1.6VTi (european B16A2 - 4door chassis)