Now how do i calculate a port using that calc u sent me?
Just scroll down the page the length calculator is down there.
Is it really worth all this trouble to go from sealed to ported?
Well like I said it depends on what you're after... you'll definately gain some output by going with a ported box.
Honestly, if I were you I'd look into some other subs. Adire audio shiva or tempest would be killer subs and they're cheap too. Two Tempest each in 4 cu ft ported @ 24hz with a 1200.1 on them Watch out! More than enough to satisfy your basshead