winISD says that with 3 cubes @ 34hz needs a 6" aeroport needs to be 16.78" including flanged in correction.

I then checked for two 4" aeros with 3 cubes @ 34hz and it says 16.05" including correction for flanged ends. My question is if this means each of the 4" ports needs to be 16.05" or if it means that I need 16.05" of total port length.

Thanks!

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