Alphasonik psw810e

[Kris4b11]

I know all you experts are probably tired of questions like this but as the title states I'm running a alphasonik psw810e ( right now in a pre fab store bought box ). I'm not new to car audio but Im new to building boxes to specs. I used a subwoofer box calculator and with the dimensions I wanna work with I will have 1.413 ft^3 and I need 1.8, I'm not going for a spl setup just sq but I also wanna have that power there if I wanna pound a little harder I'm sure you guys know what I'm talking about, now my question is, will that almost .4ft^3 make a big difference? And can I gain most of what I need with some box stuffing?