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There is very little science in that article and its all to do with a/f ratio which is also determined before entering the motor.
Put it like this, if you take my stock d16y8 out of my civic and put on a header into a 3" collector and then straight back, you will LOOSE power. Dyno proven. v8 motors use X pipes to increase back pressure for low end torque.
All in all, im not sure about the effects on fuel economy.
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