08 sti dumping flutter?

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08 sti dumping flutter. I've been told this could be intake flutter? Or waste gate flutter? It's really annoying and I want to figure out what it is. Stock bpv. Aem cai. Cobb ap stage 1 lwg off the shelf tune. Invidia n1 race cat back. Stock downpipe. Anyone got any more suggestions? It's annoying the fuck outa me. I'm hoping when I get a DP and go stage 2 and get a pro tune it will go away..? Or could it be a boost leak? I checked for leaks it shoulda been flawless.. Or so I thought.
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