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If you want to learn about naturally aspirated intake manifold design, this forum is likely not where you will find robust, peer reviewed literature.
I personally think your off in the weeds, it would be a significant undertaking with very minimal benefits to modify an existing or create your own intake manifold.
Also, still not sure, are you talking about the tube between the air filter box and throttle body or are you considering the intake manifold itself, the part that bolts to the top of the engine?
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