I HAVE HAD BOTH PORTED AND SEALED IN MY 97 DEVILLE AND IN MY 99 DE'ELEGANCE. I USED THE SAME AMP FOR BOTH AND WHILE THE PORTED HAD MORE LOW END BOOM, THE SEALED HAD A BETTER SOUND. THERE IS ONE PROBLEM WITH PORTED AND BANDPASS. WHEN THE SPEAKER GETS INTO DISTRESS (ITS ABOUT TO DIE) YOU CANNOT HEAR IT UNTILL ITS TOO LATE. THE CHOICE DEPENDS ON MANY FACTORS. ME I LIKE THE FACT THAT YOU CAN BUILD A SMALL SEALED BOX DONE TO SPECS AND USE A SUB THAT IS COMPATIBLE AND KEEP MOST OF YOUR TRUNK. I LIKE TO BOOM BUT THE WIFE LIKE TO TRAVEL AND SHOP!!! TRY GOING TO A AUDIO SHOP THAT WILL LET YOU TRY BOTH TYPES IN YOUR TRUNK. GOOD LUCK :drinker :drinker