Right now I have 2 RF T110D4's in sealed box fiberglassed to floor under back seat. I want to up grade to get it a little louder and sound better. The box now is about 1.9cuft I think. I will tear this out of course for new box. Is there anyway to jack up the seat brackets a couple of inches to allow more volume to the box? And still make it look good, and functional. I've always wanted 12's but was told they wouldn't fit. Is there any way I can get better option's with leaving the seat back there? My amp right now is a RF T10001 power series. I will upgrade that if I need too. Is there any customizations I can do to allow me to get some good quality 12's under the back seat? I only have 2 shops in my area, one say's its not a way, one says that he might be able to get those 10's in a ported box under the seat, but he was going to charge me $500 to try to build it and don't know if its going to work. I'm not going to spend $500 and it not work. So any suggestion will be appreciated

A single ported 12 of a reputable brand will destroy what you currently have.

Lifts are pretty simple on the NBS, but either require buying one or welding if you want more than .75". Hard to get much more than 2cuft without

When I bought the under-seat prefab box for my dad's F-150, it just came with about 2-3" long cylindrical spacers made of metal, and longer screws for the seats. That's all there was to raise the seat up for more room. So if you can find those two things (should be pretty easy), you have a simple lift kit. Oh and maybe it came with washers for the screw to spacer junction as well.

my friend had a box make for his 12's for his 2000 chevy so it can be done but he had kicker comps so they didnt need that much air space

KU40, do you know where I can find that kit, to lift seat up?

It was just an MTX Thunderform that we bought. I'm not sure if MTX makes them anymore.

I'd just go to your local hardware store, find some metal tubing, and cut it yourself. I'm not really sure how thick the walls of the tubing was, maybe 1/8"? Somebody with more knowledge of load handling properties of that tubing could probably give a better estimate. Then just find some longer bolts that have the same thread pattern as your stock seat bolts. Really shouldn't cost you more than 10 bucks or so I'd think.

Thanks for info.