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Ports should be free of any obstructions for about 3" to be effective... especially if it is a dense/non-porous obstruction. But, it if it is going against the back of the seats it will prove no purpose since the fabric will absorb the sound. Also, it would be best that the ports should enter the cabin of the car to be more audible/noticeable.
For better SQ the subs should face the seats but, subs usually sound better overall facing towards the trunk.
It's your call... I like sealed boxes myself. :o
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