The best way to overcome too little airspace is with a lot of power. Reflecting off the rear glass like that will give you a lot of clarity, just not as much SPL. Ideally the airspace would be better with 2 10" subs to give you a well rounded sound in that small of box. Porting it would definitely not be a good Idea, you need more airspace for porting than sealed for it to perform decent.
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