99-06 GM Extended Cab Ultra Deep Dual 10/12 Downfire Box *Best Seller*

Part #: CTB99-210/212Ultra

Fits: 99-06 and 07 Classic GM Extended Cabs
MDF Construction
Approx. Empty Weight: 35 lbs
Installs under the rear seat
No modifications required
Does not affect rear seat latching
Fits 10" and 12" round or square subs
Cutout Size: 10"=9-1/8", 12"=11-1/8"
Mounting Depth: 7"
-based on 6" magnet
Volume: .92 cu.ft per chamber
Sealed Box, separated chambers
Finish: Carpet
Terminals: Installed
Logo Text: Optional
Subwoofers Sold Separately

Notice: Please ensure your truck has the 99-06 style floor and trans tunnel under the back seat--as some 06 models have the newer body, ie 2007 style trans tunnel and seat setup which is much different. We do not accept any responsibilty if your truck is an 06 model with newer body floor and seat.

Many of our GM extended cab owners wanted us to design a box that could fit some of today's deeper, beefier subs. This box is what we came up with. This custom mdf dual downfire box has the deepest mounting depths possible to accommodate many of today's deeper subs. Up to 7" deep. So if you have a pair of deep 10s or 12s, or you just need max air space for them, then this is definitely the box for you.

This is a two-chamber sealed box with .92 cu.ft. of air space per chamber. And it pounds like no other. It can even be cut to accept 10" and 12" Kicker Square Solobarics. Simply select that option and we will cut the holes accordingly. This box is a must-have if you like your bass low and extremely loud and don't like being limited to just a few shallow models of subs. This is by far our best selling x-cab box for this truck. Get yours today!

Logo Edition boxes are Here. A perfect way to personalize your box.
You may have noticed the Silverado logo on the box in the photos above. That does not come standard on the box. However, we now off the option to get either Silverado or Sierra put on your box. If you would like that option on your box, simply select the check box to the right.