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Engines don't NEED backpressure, they use their exaust manifold to suck out more of the exaust gasses. Think about it for a sec just like we are talking about pulses for the intake there are pulses for the exaust. These pulses create vacume behind them, allowing the engine to extract more exaust (assuming they are designed properly) making more room for new unburnt incoming air. Think about it that way. And also the engine does not have to push the old gasses out they are sucked out.
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