I run a type of stealth box in my truck, or i did in Betty, its sitting by the boat trailer now LOL.

They are pretty decent i think, you need to add some batting to them and then its really up to the speaker you chosse. I use the Rockford Phosgate shallow mount 12. The JL shallow 12 is the cats meow but pricy. Or you can get the JL 13inch but its harder to mount as its a custom cut most of the time.

I run 1K watts and it pounds, i used a sealed one first time and i liked it but it wasnt as good as im used to so i had a ported box made and its awesome.

Youd think owning a F350 crewcab, the biggest cab on the market cept the Crew Max from Dode there would be room for a sub out of the way but theres not. Theres hardly any room behind the rear seat LOL. I can get you some pics of you want but the stealth boxes are nice its all about the batting, shallow mount woofer, and amp combos