After you shut off the truck is there a noticeable squeal/hum noise? We put a tbss intake/rail on midwest's 03 SS yesterday, and his is doing it now. He runs 70 psi while running (previous was only 60ish), and when you shut it off, it sounds like it's bleeding off, but it's pretty noticeable. We have the filter right by the lines, but it sounds like the noise is coming from the passenger side. Could be an echo. Hard to tell, only lasts about 5 seconds.
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