I finally got my sub box for my Avalanche. I was about to order a couple HO's when I got confused on sealed box size. I have .8 cuft per side. The guys at partsexpress said the HO takes a .25cuft. box , while the HF takes .8 cu.ft.(He wasn't too confident though). This is contrary to some of the expert opinions on some of these forums. I just wanted to make sure I buy the correct driver. I have 450w/driver (900 total at 2 ohm). I have just 5.5" mounting depth (the Daytons are 5" mounting depth). I can probably add 1/4" - 1/2" spacer if needed. I know the HO is set for higher power, small box applications. I thought .8 cuft. was small. Any thoughts you might share before I order tomorrow would be helpful. If there are any other subs that might work better I'm all ears. Thanks. Very helpful forum btw.