we're gonna have to wait for the DIY guys or wmax to chip in.
pros:
less resonance
possible more volume due to more absorption?
cons:
possible less volume due to more OC703?
From what I understand about adding OC705 (as explained by WmAx) at least is that it doesn't really affect internal volume of the box, but adding it will adjust the location of the bass roll off by lowering the internal airs ability to resonante. So if you add some you will need to tweak it so the sub rolls off where you want.
So in the end it will just be a trial and error process, but can be beneficial.
