ported box under truck seat

Alright My 2 10 inch Rockford Fosgate HX2 sound very good under my seat in my 2006 ford f150 extended cab. But I want the bass louder and To get deeper. So I am condering getting my sealed box ported. My Box is single chamber 1.3 Cft  with polyfill. The minumum requirements for a ported box for each sub is .625cft tuned at 32.7 Hz... The displacement of the subwoofers are .055 cft each.

What I am trying to figure out is would getting this box ported sound better than keeping it sealed. And the specs of the port I would need and how many. Heres a chart for the sub box reccomendations http://194.204.29.93/rockford/Real%20Bass%202003/Docs/06-Woofers%20by%20Volume/101.jpg

Also With it being Dual Subwoofer--single chamber enclosure. do the subwoofers recognized eachother? and is there a certain amount of air space taken from each sub?or do they still feel that they are in a single 1.3cft box? (Polyfill is in the box)