I'd say probably keep it right there. Thats 15 inches of port per cube. I usually follow the general rule of 14-16 sq inches of port per cube, always had goodluck with that with about 5 different boxes for lvl 4's/lvl 5 coils and my XL's i currently have.
Team DC Audio : Team NWSPL : Team Shok
02 Tahoe - (1) 15'' XL, Shok II, Shok 1/0
03 S10 (in progress) - (3) 15'' Lvl5's, (2) DC 5k's, lots of Shok 1/0
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