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V engines are more likely to utilize the technology correctly than inline engines are. In a V engine, the air that gets pushed out can simply cross over the plenum to the next cylinder in the firing order, whereas in an inline engine, the airflow has to change directions 3 times.

Once in the reversion cycle that puts it out of the cylinder, then sideways in the plenum to the next cylinder's opening (which could be against airflow, going from 1-3 and 2-4, at least in Honda engines), then down the next cylinder's runner along with fresh air.