Hey guys. Got a question. I have a 2012 wrx and just recently I started hearing this whistling noise when I'm on boost (any gear). I only hear it on occasion mostly when it's below 40 degrees. Can anybody tell me what is causing this noise? I was thinking it was a bov leak but it only happens sometimes. I brought it to my tuner and they didn't hear anything. Thanks in advance. Otherwise everything is fine. Afrs are good, no excessive knock under fine knock learn.
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