checked your intercooler / hoses?
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sound like a truck air release, if it's when your on the throttle ( turbo boosting ) it could be an intercooler or hose blowing out, if your getting fuel cut as well check the lines from the pipe to boost modulator through to the wastegate
See that’s it tho...hear mainly on idle & not sure if it’s tgete above due to engine noise. No apparent driving issues. Still pulls like a train uphill compared to before the remap. Just concerned that left unchecked will lead to badness while in the desert middle of this year.