Up or Down Firing?

I have a 04 chevy silverado extra cab and I want to get a box that sits under the rear seat. Whats sounds better up firing towards the seat or down firing?  Also 2 10' or 2 12's? Thanks!!

I prefer down.

"Also 2 10' or 2 12's? Thanks!!"  Neither, just one 10 or one 12.  Get a high quality subwoofer, put the rms power to it, and build a good enclosure and you'll be pounding.  You do not need 2 subwoofers to get great bottom end.  Bass is not recorded in stereo.  You simply dont need it.  What subs are you considering anyhow?

You have the space to put a w6v2 under the seat of your truck?  How much space do you have?  Have you measured it?  Are you thinking about a prefab box or a custom enclosure (fiberglass)?  I have a 10w3, great sub.  I used to have it in a 83 Chevy regular cab on a us amps terminator 250, sealed enclosure - it filled the cab with hard hitting, tight bass.

You want recommendations for what?  amps, components, subwoofers from Directed?  How much cash do you have?

The 10w6v2 only needs like a .5 cu ft box (.75 is recomended i think but drop two of them b***es in there and you will slam the crap out of that truck.  I don't recomend a prefab. box but if you really want then check into the wedges.  But some of those might not have the mounting depth you need.  I tested one under my seat (extended cab silverado) and it fit nice and snug.  But I don't think a JL would fit. 

I just visited the Directed website and realized I have never heard any of the new stuff from directed.  I heard lots of the older stuff, like from 2 years ago, viper, dei - they sounded nice, but were spendy at the shops up here.  Old Orion and PPI (precision power) amps were good sh*t, I imagine they upheld the tradition with the new stuff???  So, Im not going to make a recommendation on the Directed stuff, good luck with that : )

I’m a JL audio guy, love the stuff for most systems, unless you on the tightest budget.  If you can afford it I would go with the w3v2's, I don’t like making modifications to vehicles unless its really necessary.  To get pounding bass in your ride; I don’t think it is, in this case.