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Yes,it is the BOVs and is a characteristic of the 4X/3 bar tune. It happens with boost and then when you back off relatively quickly. Many of us have noticed that. I can't explain WHY it seems to be a characteristic of the 4X but it seems to be normal. I was running my BOVs stock and noticed it. I then vented them to atmosphere and the noise was a bit louder immediately followed by a "Ppfffttt" sound. Wish I had a more techical answer. Perhaps only Dan Millen could provide that.

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