My guess is it's just the BPV making a totally normal noise. Not quite enough boost for it to open all the way to vent, but enough that it bounces a few times.
There's probably nothing wrong, or perhaps there's just a leak in the by-pass hose or something that's making it louder (and would cause the car to run rich during shifts).
Have KSpeed check it out when you're there for the tune?
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