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Convention wisdom is not always correct. A larger TB opening will allow more power to be produced, but increase the rpm at which you achieve peak torque. Thats really not what we want to do. Nor do we want to restrict the engine from breathing. This is exactly what closing the throttle plate does. There is no need to add another plate! If you look at BSFC charts you'll see what I mean.
What you want is a properly sized port tuned for the RPM at which you'll be operating the engine.
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