need help with aero ports

[skippy90210 10+ year member]

im building a box for my cobalt for 3 sq hds3 12's

its gonna be 8 cubes before any displacement and I want to do aero ports up through the rear deck of my car firing off the rear window.

my question is what should I use 1 6'' aero or 2 4''? and how long will they need to be?

im wanting to tune between 30-32hz because I want to hit the lows

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