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typically in a turbo engine, reducing compression and increasing turbo size (not necessarily boost) will yield more power. it will however hurt transient performance when off boost. this is because the turbine in the turbo is far more efficient at compressing air than a piston is.
sadly, unless he is willing to kill his exhaust valves with anti-lag, almost all street car applications, you are trading between peak power, and spool. can't have both. power, spool, reliably, pick two.
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