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Does it bog no matter what past 3,500rpm? Like if you just tiptoe up the revs and stay out of boost can you get past 3,500?
My immediate impression would be a boost/vac leak. Check all of your couplers, and vac lines for tightness/cracks. I always have rough luck find leaks so I usually just take it to a place with a smoker to make life easier and give me a definitive yes/no answer. Because some boost leaks won't always be a vac leak as well, and they will only crack open at say 4psi, acting like a small wastegate.
If it's a consistent bogging at 3,500rpm regardless of boost, I would say it's probably a fuel issue. Not getting enough pressure or volume. Not sure what kind of mods you have, maybe your fuel pump is on its way out, or your filter is clogged af.
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