I have no idea about the pluses and minuses. A plenum between the exhaust valve[s] and the spool might be necessary or gathering multiple exhaust pulses (OP's question) in a header; OR less heat energy is lost before the turbo. 
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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