I can't hear the audio...the links want me to pay for it for some reason...Anyway, I will check the spring once the car is ready for tuning. It may be too stiff, and the waste gate is fluttering.
Will have to also drill and tap the IM so the BOV has it's own dedicated vacuum source. Since I did not have a base map on hand, the stock injectors were left in place and the IM did not have to be removed. So it was never drilled/tapped for the BOV vacuum source.
I have had my kit on my own car for 4 years now, and there is a bit of flutter only on light acceleration between shifts. With 25,000 miles on the system there is no issue to date. The only thing that would be of concern is compressor surge while in boost. A softer spring could also be beneficial...but it is hard to say without knowing the exact vacuum at idle while the engine is warm.
Either way, nothing to worry about.
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