Building my box need lil help

[grnrpr68 0]

Hello again hey everyone i am trying to built my box for 2 18" fully loaded dual 2ohm btl's...I am either running 2 md-3d amps (us amps ) 2000rms at 1ohm or hifonics brutus amp (not sure model number) it does 2000rms @1ohm ...and i want to have the box @ 5cu per side tuned at 32hrzt that seems to be a good spot for daily ground pounder but not sure about port size the box is going in a 99 yukon so room isnt a issue...please help thanks agian