Front Firing or Side Firing port (Pictures inside)

Its a Sundown E10v3 on 600 watts. Box is 1.28 cubes net @ 30hz with a 4 inch precision port. The car is a 99 civic.
My goal is to get low. I plan to have the sub firing into the cabin with the seats up most of the time.

I was wondering if I should take the time to get custom work done to incorporate a 90 degree elbow and have the port also firing into the cabin which is location B in the picture or if it would be sufficient if I side fired with either port position A or C.

Of course I'd like to have the most SPL out of this application too. I'm just wondering if I should take the time and effort to fab a front firing port or just go the easy route and do a side firing port and either location A or C

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i heard a car with 2 12s during sbn with subs forward and a small square port on the driver side of the box near where you marked C with the port on the rear wall... it was pretty retarded how loud it was.
i mean.. this port was like 30-40 sq in lol wasnt sure what was going on

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