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The air box is there to insure that the intake air is balanced to all runners, the size is carefully calculated for best effect based on what the engine builder needs for "power Band"

On multi carburetor engines the air box also contains the fuel "Spit Back" that is needed for the tuned carbs to provide the correct mixture. Spit back is a cloud of fuel that is sprayed backwards from the carbs at certain rpm.

And finally the car or motor cycle builder uses it to reduce noise.

If you are going to remove it you may need to change the fuel calibration for the engine.

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15y ago

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