My teapot mod is a li'l different... I did a boost leak test last weekend and tightened up a medium leak on the clamp right behind the turbo and a major one on the hot side to intercooler pipe clamp... and that's when the teapot mod started.
The thing is, it only does it when the car is warming up, around 10 vac on up. I don't boost while the car is warming up, but there definitely is a VERY high pitched whistle until the car hits 200 degrees, then the sound goes away completely until the next cool down. This only started this weekend AFTER we fixed a major and minor boost leak. I've got a custom intake and FM wga on stock turbo.
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