Need Help With Replacing Factory Subwoofer in 2012 Si with Premium Audio.

I would not waste the time,this had been a nauseating problem.i would go aftermarket and get real bass .
 
For an after amrket sub, can one just buy a 10' or 8' (cant remember how big the premium one is), and fit it in the sub spot behind the back seat? Because even the premium audio sub is not real great at all
 
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