cynner wrote:Sounds very similar to this... http://www.youtube.com/watch?v=1kZImeImmKo
(this is not my car, just a video showing a similar sounding noise). I don't have a manual boost gauge so can't tell if it's actually doing this exact thing.
Haha no if your car is properly tuned the boost gauge certainly won't be doing that. That thing is either faulty or something is wrong with the WG.
The pierburg sounds just like cynner said before, similar to a little Wastegate fluttering inside the engine when you're on high boost. Like a fast ticking/rattling sound. It's doing it's job of keeping your boost nice and even to what the tune is asking.