Yea that not enough port area to make any good sub happy. Is there any space below woofers that leads into the spare time well? In my trunk I am building the port right below the 2/15s and the port extends in the spare tire well about 20 inches. I was able to get 85 sq inches of port are thAT way. I am not sure how well it will work and it is a major custom engineering job involving lots if fiberglass.
If you don't want do all that I would think about 2/12s or a single 15 or 18 front firing. That way you can get the port area the subs will need. I ran a single 18 last year forward firing and had great results.
2013 and 2011 Midwest SPL Extreme Trunk Champ
94 Honda Accord
Two DD 9915 SC front firing out of the trunk
2 DD M4a's
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