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good question! as a rough guess, I would say that all other factors being the same, regardless of what turbos, to make your theoretical 320kw atw, you would need to be pushing x amount of boost into the motor, so whether you have small turbos going gangbusters to make y-psi of boost, or big-ass tubs idling along at y-psi boost, the stresses on the rest of the engine are much the same...
the only differences would be exhaust backpressure due to different tubs and possibly oil temp/pressure due to the same.
now, for an expert to come on here and correct me, cos I figure I must be missing something fundamental!
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