Ok, where to start...
From the top.
Putting a box on you back seat is a terrible idea. Most of these boxes never sound that well. It also adds to the "steal me" factor. Ive had boxes on my rear seats before, never cared for it. Always been louder in the trunk due to cabin gain.
Next.
Porting the subs towards the amps isnt a good idea. First reason is unless the port is a 1 1/2 diameters worth away from any object you will be impeding the port. Thus effectively changing the ports properties to something incalculable.
Second- What goes out comes in. So the aire in the port is acting like a spring- pushing back and forth. It doesnt "blow" it doesnt "suck"- it doest both equally.
I would go for the fans if your die hard into this box. But a dollar to a dough nut says it will be louder in the trunk by a very measurable/noticeable amount.
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-Ryan
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