another aeroport question

[bunkerking09]

When i plug in the numbers on this website for a 4 inch diamater, it says i need 14ish inches of port to get 40hrz, when i enter 2 inch diamater, its only like 2.75, is there a benefit of doing it either way?

[Lakota]

The larger you make the port area the longer the port needs to be to have an equivalent tuning. How much port area you need depends on the setup.