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Er t vago, the exhaust stream is at relatively low pressure (maybe like 3 bar if NA) but high temperature, so you need a heat transfer of some sort to be able to pick up the majority of the power. A turbo creates a greater pressure drop using the piston's power.
A good turbo system has less backpressure than boost pressure, but there's always a bit of excess pressure left in the cylinder if the expansion and compression strokes are equal so ideally we'd have no backpressure at all.
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