not really possible bud. But... I would say if your in an SUV you should be at atleast a 140.i know they do just need a rough estimate
seats folded down or up? what is the specs of the box?how about for a box built to dimensions prefered by RF in the trunk of a impala
oh ya fold down those seats //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif! More air flowinahh it was custom built its ported and you say if i fold down the seats ill get more DBs