Please review the Compatiable Truck List before Ordering!

Designed to get the most from your subwoofer! This is a great option for those looking to SAVE MONEY and DIY but might have limited access to tools. Provide us with a little bit of info and we handle the rest. All parts are cut to size, sanded smooth, and pre drilled. Assemble can even be done with a screw driver!

Some Options Require a Seat Lift

DODGE RAM BOXES

All Subwoofer combos requires a seat lift!

CLICK HERE to order a seat lift

2008-2018 GM-Chevy/GMC Boxes

These options will not need a seat lift

(1-4) 6.5", (1-2) 8"

These options will Require a seat lift

(4+) 6.5s, (3+ ) 8s, any quantity of 10" or larger

CLICK HERE to ordered a seat lift

2019-2024 GM-Chevy/GMC Boxes

These options will not need a seat lift

(1-6) 6.5", (1-4) 8s, (1-2) 10s

These options will Require a seat lift

(+2) 10s, any quantity of 12s

FORD BOXES

These options will not need a seat lift

(1-4) 6.5", (1-2) 8"

These options will Require a seat lift

(4+) 6.5s, (3+ ) 8s, any quantity of 10" or larger

CLICK HERE to order a seat lift

Some larger woofers regardless of truck will require you to run a seat lift.

We encoruage the use of a seat lift whnever possible as MORE SPACE = MORE BASS in most cases. Please be sure to check out LMI WELDING for all your seat lift options to see which seat lift can be used for your truck!

Designed to get the most from your subwoofer! This is a great option for those looking to DIY but might have limited access to tools. Provide us with a little bit of info and we handle the rest. All parts are cut to size, sanded smooth, and pre drilled(optional). All you need is Wood Glue, a power drill and some free time!

Compatatible Truck List!

GM- Chevy/GMC

2008-2013 Chevy Silverado 1500 Crew Cab

2008-2013 Chevy Silverado 2500 Crew Cab

2008-2013 Chevy Silverado 3500 Crew Cab

2014-2018 Chevy Silverado 1500 Crew Cab

2014-2018 Chevy Silverado 2500 Crew Cab

2014-2018 Chevy Silverado 3500 Crew Cab

2007-2014 GMC Sierra 1500 Crew Cab

2007-2014 GMC Sierra 2500 Crew Cab

2007-2014 GMC Sierra 3500 Crew Cab

2015-2018 GMC Sierra 1500 Crew Cab

2015-2018 GMC Sierra 2500 Crew Cab

2015-2018 GMC Sierra 3500 Crew Cab

2019-2024 Chevy Silverado 1500 Crew Cab

2019-2024 Chevy Silverado 2500 Crew Cab

2019-2024 Chevy Silverado 3500 Crew Cab

2019-2024 GMC Sierra 1500 Crew Cab

2019-2024 GMC Sierra 2500 Crew Cab

2019-2024 GMC Sierra 3500 Crew Cab

2019-2024 Chevy Silverado 1500 Double Cab/Extended Cab

2019-2024 Chevy Silverado 2500 Double Cab/Extended Cab

2019-2024 Chevy Silverado 3500 Double Cab/Extended Cab

2019-2024 GMC Sierra 1500 Double Cab/Extended Cab

2019-2024 GMC Sierra 2500 Double Cab/Extended Cab

2019-2024 GMC Sierra 3500 Double Cab/Extended Cab

FORD

2009-2024 Ford F150 SuperCrew

2017-2024 Ford F250 SuperCrew

2017-2024 Ford F350 SuperCrew

DODGE

2019-2024 Dodge Ram 1500 Crew

Underseat Truck Flat Pack Ported Subwoofer Box

Name: Underseat Truck Flat Pack Ported Subwoofer Box
Brand: CustomLowz

From $449.99

Rounded Corners?

Add Plexiglass Windows

Add Screws and Glue!

Port Style

Exact Truck Make, Model, & Year

0/500

Subwoofer brand, model, & Size/Quantity. And tuning Preferences

0/500

Quantity

1-3 Weeks! Updated 10/23/25

The longest part of the order/lead time is waiting for your order to be "next". After placing your order, you will get a rendering in your email before we start building. Getting your rendering is an indicator that your project in queue to be done soon. Confirming your renderings in a timely manner is imperative to stay on schedule. Your order will be sent VIA UPS and can be tracked via provided tracking number

Lead time History/archive!

10/23/25 - 1-3 Weeks!
Place your parts according to the assembly instructions. Glue each Joint (as a good rule you should use enough wood glue that there is a bit of squeeze out when placing each part) and Secure each part with supplied or recommended wood screws. You will need a t20 screw driver and/or drill/impact to assemble if using the supplied screws. Be sure to not over tighten. Clamps are recommended but not needed. If not using the supplied wood glue, we recommend titebond 2. Clean away excess glue with a damp rag periodically during assembly process.

If you added a plexiglass window, use clear silicone and run a thin bead around the entire perimeter of the window cutout approximately 1/2" - 3/4" away from the cutout. ( To limit excess squeeze out, only use a thin bead of silicone as it is only used for a air seal. If excess squeeze out occurs wait from it to fully cure before removing. Only remove excess that can be see from the outside of the box, as excess squeeze out that occurs on the inside of the box will not be seen. ) Remove the protective film from the side that will be touching the silicone and align piece with the pre drilled holes pressing it into the silicone bead. Secure with supplied or recommended wood screws.