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You're missing the point. When there's uneven scavenging and backpressure, the injectors can't inject more fuel into some cylinders and less into others. Thus you will have the wrong amount of fuel in ALL the cylinders.
This is why unequal length headers are bad for performance, the screwed up scavenging makes it hard to deliver the correct amount of fuel to any cylinder, so you have to just squirt more fuel altogether, which is not good.
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