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I don't think you'll see a difference. Diesels, which do not have throttles, have a lot more gasses passing through the system at all times than a similarly sized throttled gas engine. That makes them more sensible to back pressure and negative boost. Yet, at least for TDIs, people removing everything from the turbo back do not generally report increased FE. There probably is an advantage, but it's probably 1-2% or less.
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