Im no expert, but if you get vaccum in somewhat normal levels and it doesnt matter if the BOV is hooked up or not then i'd say the spring in the BOV is to tight, or set to a psi your system doesnt reach, so it never opens. You could try the bov on a different car, or hook it up to air hose to...
Have you heard a ssqv before? Because almost all of them sound like you are getting some kind of flutter, its just what they sound like, mine does.
You can also go on you tube and search for videos of what an ssqv sounds like, or what compressor surge sounds like.
1 piece aluminum drive shaft, roughly 20 pounds drop
downpipe that cuts out the stock turbo elbow (and the 1st cat) few pounds drop. stock turbo elbow is solid cast iron, heavy!
stuff like that im guessing
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