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Not just CFM, since you can just reduce the temperature and you'll have less energy/wake infill, but volume at ambient (pressure/temp) per unit time. W/ a turbo we're using some of the energy from the exhaust to compress air so the energy that's left in terms of equivalent gas volume at ambient pressure/temperature would be less than what it would be w/ an uninterrupted exhaust stream, but either way it's a very small amount, something like a third of a cubic foot per second at low highway speeds IIRC.
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