Quote:
Originally Posted by austin
From what Ive read it is a symptom of excessive shaft play caused by bearing wear.
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By the time you start hearing siren sounds from bearing wear your turbo(s) aren't going to last another few thousand miles. I think people are barking up the wrong tree. I think it's just poorly seated factory inlets that leak especially when the compressor if cold. I had zero siren whine, put on aftermarket intake siren sound appears. By the time I'm a few blocks firm my street is gone for good until the car is "overnight" cold. If the factory intake had ever been off for any reason there is a good chance the inlets aren't perfectly seated. All speculation of course.