https://www.decware.com/cgi-bin/yabb/YaBB.cgi?board=Wicked;action=display;num=11...

if the box is already the ideal size then you wouldnt need stuffing...

why do you feel the need for stuffing? it may not actually be the solution you seek.

at 3lbs per cube (thats a lot) the gain in a sealed box is 25-30%, which would be enough to extend bass response by a noticeable margin.  if the box were 30% too big for the driver then the cone would move more and you may receive a penalty in max power handling for that, but nothing else, save better bass response.  This may come at the expense of increasing group delay as well though...