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2. stock turbo boost cut is via maf voltage. You can either verify the maf voltage is an arbitrary high number (4.5v+ during symptom) or start diagnosing the maf situation (do a boost leak check, clean maf, change maf, block off the blow-off valve)
1. you must be 100% sure the bypass isnt leaking during boost (or anything else) so do a boost leak test by filling the plumbing with compressed air. My initial guess/hope/simplest solution is that you have an enormous air leak somewhere.
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