Purchased my wrx last week and I'm loving it. It makes one curious sound that I don't know what it is.
Iit sounds like a very quiet hissing. Almost like gas passing from one valve to another. It happens off and on during normal driving conditions. It happens during constant speed but has also happened during acceleration and deceleration.
There is a clear difference between the sound of the turbo and this small almost faint hiss.
Is this the work of the stock bpv?
Thanks for the input, love the forums, such great information here!