Idk, thats hard to say. Of course if you upgrade your electrical more and throw more watts at the BTL, it may get louder. Im not a big sub guy, I like 10s, but if I am not mistaken, isnt 6 cubes a lil small for a BTL? With my experience, the more air space you have to let bass come into the cabin, the better. But you may get away with it, with sub up, port side.