first ported box 06 saturn ion

[saturnion06]

i want to buil my first box on this stereo instal it will be in an 06 saturn ion the amount of trunk space used is of no concern the subs i would like to use are 2 polk dxi dvc 4 ohm 12s im going to run about 400 rms to each sub and i want the box ported what would the optimum measurements be fore a box and should i use polyfill if need be i will find the stats for the subs and post them im open to ideas ive just never built a box before this will be daily use on music from hip hop to country.

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