I have been reading the forums for quite a while now, but this is my first post!

I have been looking into getting a sub for my 99 extended cab. I am 18 and new to both cars and audio. I have already put in a new head unit along with the dash kit, and new infinity speakers in the front doors. Next is the sub, I am a tall kid (6' 2") and need the driver seat pushed all the way back so I was thinking to put a sub behind my seat that can be as big as going all the way to the midway point of the back, so that the other back seat is still use-able. I've done a little bit of research and know that my dad and I could build a box for the back seat if necessary. But what has sparked my interest is the pre-built sub kits. I would buy something like MTX Terminator Package, which comes with the sub, box, and amp, then also buy a wiring kit. What are peoples thoughts on this? How would this sound? Or on that idea, do these kits have the ability to sound good?

I love the all around equal sound, but also like to sometimes turn up the bass and let it kick. I'm basically just asking for advice on this, and whether or not it is worth the price. I'm new to car audio and am trying to be like a sponge and soak all the information in.

I feel like a sub kit would easier, but I want to get the most out of my money. Would it be better to build everything myself? If i go with a kit like this I would build a little step out of mdf, not only to not have to worry about the angle, but so it looks nice also.

Any thoughts, ideas, or concerns would be greatly appreciated!

EDIT: Also, should I get an amp for my infinity kappa speakers? Would it be worth it? And once I get my subs in should i get bass blockers for the speakers??

As tall as you are, you are going to find it hard to fit that box in the back. I have one JL 12 in a box that stradles the hump in the back, and my seats are pressed against the box leaving no room to move them back. If you put that box back there, the seat back frame will stop you from sliding the seat back.
As for the price and quality, that is always debatable. I got my 2 JLs and a JL amp for a 100, from a member here. So look around before you commit to any one setup.

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'02 XLT ext. cab 4.0 4x4 Off Road
Usual mods
Unusual color
Only a real man can pimp DWB

If you are more worried about space than money, go for the MTX Thunderform enclosures. you can find them on the MTX website. They won't be ear-shattering, but they will sound really good. Otherwise, you could remove one of the jump seats, and then build yourself a custom box tailored to your space. I am a big proponent of DIY, so if you are pretty handy, give it a try. I built several boxes in all shapes and sizes for me and my friends, and as long as you take your time, and make sure it seals well, it should sound fine. A big driver of what to install is what kind of music you listen to most, and how loud/expensive do you want to go? I listen to mostly rock, and I have an MTX 8500 series 10" with a 500 watt Fosgate amp that hurts my ears at full volume, but sounds amazing in a custom ported box (in my '93 Silverado. The other thing is, don't underestimate the importance of your other speakers. If they aren't good quality, and clear-sounding, then you will drown them out with a sub, and your system will not be as enjoyable. If you have any specific questions, send them to me. I am no expert, but I have a lot of experience, and I can probably point you in the right direction.

Thanks for the replys guys!...
I'm not too worried about the space, i measured for this box and seems like it should fit, do you think these would sound that much better then the thunderforms? If i do get the Terminators above, could you recommend a better amp to go with them? I've read that the amp that it comes with underpowers them! Additionally, could you recommend an amp for my speakers??

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1999 Ford Ranger, 3.0 L v6, 2 12" subs behind driver seat. Painted Black Rims. Body Lift on the way.

I use to sell MTX and that amp is designed for that setup. Problem is most people don't set there adjustments correctly. It bumps quite nicely for the price when adjusted correctly

That setup looks fine...I have always been partial to Fosgate amps, but there are many good brands out there. The Thunderform probably would not be as loud as that setup, just a good use of space in a very respectable sound package. If you did want to power your Infinity's, look for their power handling rating and find a multichannel amp that fits accordingly. I prefer to over-amp my speakers a bit, so that my amp can be turned down below max output (they tend to get hot when pushed hard, and heat is electronic's worst enemy). What kind of deck do you have? Some, like my Pioneer, have built-in High Pass Filters that eliminate the need for any other kind of filter to your component speakers. I normally like to build my own boxes, so if it were me, I would buy the best quality speaker in the size that is right for your music of choice, that I could afford, then build a box for about 40-50 dollars for materials. I glue all the joints, then pre-drill and screw them together with flathead wood screws, then caulk the inside of the joints just to be sure that they are air tight. Measure twice, cut once, and it is very easy to build a box that you will be proud of. Manufactures advertise the volume needed for each specific speaker, and you can google the formulas to figure the volume of any design you have in mind before you start. Good luck, and any more questions, shoot!