i will have to get a pic of mine... Take your seats out. Build a massive box ~ 7cu ft per sub for 15's or 18's. keep it under the window line.. subs forward ports up is the loudest hands down. Slot port accross the back glass.. no precision ports. You will enjoy it. im hittin gover 155 db
You are not going to be able to get anythign very loud under your seats PERIOD. I have a custom box build to go under mine when i had them in and the most you can get is around .75 cu. ft per sub which is nothing. I had 2 solobaric 10" l7's and they just werent very loud... you cant get anything lous with that little of airspace..