BEST BOX FOR A LINCOLN TOWN CAR '2000'

I WAS WONDERING WHAT IS THE BEST BOX FOR MY LINCOLN TC I HAD A PORTED WITH TWO 12 MTX 8000 AND THE BASS SOUNDS GOOD WHEN THE TRUNK IS OPEN BUT WHEN ITS CLOSED CANT HEAR OR FEEL ANYTHING THENI GOT A SMALL SEALED BOX THE ONES THAT GO IN A 01 SUPERCREW UNDER THE SEAT AN I PUT IT RIGHT BEHIND THE SEAT.... A LIL IMPROVEMENT BUT STILL COULD ONLY HEAR CERTAIN NOTES... TO START OFF THE TRUNK IS WIERD ITS LIKE A STEP THERE IS A UPPER PART AND A BOTTOM PART I HAD THE PORTED ON THE BOTTOM PART CUSS IT DOESNT FIT IN THE UPPER PART AND THE SEALED ONE DOES FIT BUT NO GOOD SOUND WHEN THE TRUNK IS CLOSED... I WAS WONDERING IF ANYONE NOWS IF THE SUBS ARE SUPPOSED TO BE POINTING A CERTAIN WAY OR THE PORTED HOLES "IF ANY NEEDED" NEED TO BE AT I WANT LOUD THUMPIMG BASS,... IF IT HELPS I HAVE A 600A2 AUDIOBAHN COMPETITION AMP AND A KENWOOD EQ HOOKED UP TO IT AND THE SUBS ARE RUNNING AT 2 OHMS PLEASE HELP!!!! IM GETTING A CUSTOM BOX DONE BUT THAT GUY DOENST KNOW ANYTHING HE IS JUST MAKING THE BOX...