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Custom GMC Sierra Subwoofer Box 07-13 Extended Cab Dual 12

SKU: GM2X12-EX07_2
In Stock FREE delivery
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We finally have a custom fit enclosure available for the new body style Chevy 07-13 Silverado / GMC Sierra extended cab truck! This dual 12" enclosure is designed to fit under the rear bench seat and is a down firing model. Why down firing? Not only does it help improve the overall SPL output of the subwoofers but it also keeps the subs out of view for security reasons. This enclosure is compatible with a wide range of sub brands and model but entry level and flat piston subwoofers tend to work best.

Our boxes are made from precision cuts of MDF. They are then liquid nailed, nailed and completely sealed. We then wrap them with high quality carpet that matches most vehicle interiors. All Boxes feature high grade spring loaded terminal cup(s) for the absolute best connection possible. All the custom series enclosures are made to fit precisely into your 07-13 GMC Sierra Extended Cab to the get the max performance from every extra inch of wasted space.

We guarantee you will not only see a difference in the quality of the boxes we build, but you will hear the difference and that is what is it is truly all about.

Custom GMC Sierra Subwoofer Box 07-13 Extended Cab Dual 12"
SKU: GM2X12-EX07_2
  • Dual 12" 2007-2013 Chevy Extended Cab Sub Box
    • Mounting Depth: 6"
    • Air Space: 0.60 Cubic Feet Per Sub
    • Sealed Enclosure
    • Dimensions: Width 55-3/4" x Front Height 8-3/4" x Rear Height 5" x Depth 14-3/4"
  • Constructed with High Quality MDF
  • (2) High Quality Binding Terminal Cups (Accepts Banana Terminal Plugs OR Bare Wire 'up to 10GA')
  • High Quality Black Carpet
  • Enclosure installs under rear seat down firing
This box fits:
  • 2007-2013 Chevy Silverado Extended Cab
  • 2007-2013 GMC Sierra Extended Cab
This item is New
Proposition 65 Warning for California Consumers

WARNING: This product can expose you to chemicals including Formaldehyde (gas) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to

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Frequently Asked Questions for this Product:

When will my order ship?
Most orders placed before 3:00 PM CST will ship within 24 hours. If you need a product by a specific time please contact us at 1-877-275-4434 before ordering.
When will I receive my tracking number?
Most tracking numbers are sent out around 5:30 PM CST of the following business day. Please allow 24-business-hours after ordering before requesting tracking information.
How fast will I receive my product?
Depending on your location it may take 3-4 business days for your order to arrive. Your tracking number will tell you the exact day your order will arrive. If you need an order by a specific date we recommend you call us at 1-877-275-4434

Return Policy
Due to the size of this item it cannot be returned for a refund. If the box is damaged in-transit we will replace it.